Control search space overlap indication

ABSTRACT

A user equipment (UE) may receiving, from a base station, a synchronization signal block (SSB) of a set of quasi-collocated (QCL) SSBs, the SSB comprising an indication of a parameter indicating information associated with a plurality of downlink control channel locations corresponding to the set of QCL SSBs. The UE may determine, based at least in part on the parameter, the plurality of downlink control channel locations corresponding to the set of QCL SSBs. The UE may receive a downlink grant for a system information based at least in part on monitoring one or more downlink control channel locations of the plurality of downlink control channel locations. The UE may receive the system information based at least in part on the downlink grant. The UE may establish a connection with the base station based at least in part on the SSB and the received system information.

CROSS REFERENCE

The present application for patent claims the benefit of IndiaProvisional Patent Application No. 201841042779 by SUN, et al., entitled“CONTROL SEARCH SPACE OVERLAP INDICATION,” filed Nov. 14, 2018, assignedto the assignee hereof, and expressly incorporated herein.

BACKGROUND

The following relates generally to wireless communications, and morespecifically to control search space overlap indication.

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such asLong Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, orLTE-A Pro systems, and fifth generation (5G) systems which may bereferred to as New Radio (NR) systems. These systems may employtechnologies such as code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA),orthogonal frequency division multiple access (OFDMA), or discreteFourier transform spread orthogonal frequency division multiplexing(DFT-S-OFDM). A wireless multiple-access communications system mayinclude a number of base stations or network access nodes, eachsimultaneously supporting communication for multiple communicationdevices, which may be otherwise known as user equipment (UE).

Wireless communication systems typically support a variety ofcommunication techniques to support wireless communications between abase station and the UE. For example, a base station may transmit avariety of synchronization signals (e.g., synchronization signal blocks(SSBs)) to support acquisition by UEs. Generally, the SSBs may carry orconvey various parameters associated with the base station that the UEuses to align (in time, frequency, and the like) with the base station,at least to some degree, in order to establish a connection between thebase station and the UE. Conventionally, a limited or defined number ofSSBs are typically transmitted by the base station. In a millimeter wave(mmW) network, the base station may transmit the SSBs in beamformedtransmissions in a sweeping manner around the coverage area of the basestation.

Conventionally, the limited or defined number of SSBs available fortransmission supported a one-to-one mapping between the SSBs and variouscontrol signal resources. For example, each SSB may have a correspondingset of control signal (e.g., physical downlink control channel (PDCCH))resources associated with it, e.g., index number for the SSB maycorrespond to a particular PDCCH resource. However, conventionaltechniques do not support a configuration were additional SSBs may beused for transmission, e.g., may not provide a mechanism that supportsan indication of PDCCH search space overlap. Accordingly, in thesituation where additional SSBs are available for transmission,conventional wireless networks may not support mapping a plurality ofSSBs to a particular control channel resource.

SUMMARY

The described techniques relate to improved methods, systems, devices,and apparatuses that support control search space overlap indication.Generally, the described techniques provide for various mechanisms thatimprove indicating overlapping control channel locations correspondingto a set of quasi-co-located (QCL) synchronization signal blocks (SSBs).For example, a base station may transmit a plurality of SSBs from a setof QCL SSBs. In some aspects, each of the SSBs within the plurality ofSSBs carry or otherwise convey an indication of an offset betweensuccessive SSBs within the set of QCL SSBs. Broadly, the offset mayrefer to a parameter carried or conveyed in the SSB (e.g., a physicalbroadcast channel (PBCH) portion of the SSB) that allows or otherwisesupports the control channel location overlapping for different SSBs. Auser equipment (UE) may receive one of the SSBs transmitted from thebase station and determine the indicated offset. Based on this offset,the UE may determine a plurality of downlink control channel locations(e.g., physical downlink control channel (PDCCH) locations) thatcorrespond to the set of QCL SSBs. The UE may use the determineddownlink control channel locations to receive a downlink grant for asystem information signal (e.g., a remaining minimum system information(RMSI)), e.g., by monitoring the downlink control channel locations. TheUE may receive the system information according to the downlink grantand use the information in the system information (e.g., RMSI) as wellas the SSB to establish a connection with the base station.

In other aspects, the described techniques may support rate matchingoperations of the UE. For example, the system information (e.g., RMSI)may carry or convey a bitmap that indicates a subset of SSBs that areactually being transmitted from a set of SSBs, e.g., the bits within thebitmap may be set to “1” to indicate that an SSB is transmitted in thatlocation, or vice versa. In some aspects, the system information mayadditionally carry or convey an indication of a maximum number of SSBsavailable for use that is greater than the total number of SSBs in theset of SSBs. For example, the bitmap may be configured as “10101010” toindicate that SSB positions 0, 2, 4, and 6 are actually beingtransmitted within a set of SSBs consisting of SSB positions (orindices) 0-7. The indication of the maximum number of SSBs may be set tothe number of the maximum SSB position being used, e.g., 12, 16, 18, orsome other number of maximum SSB positions that may be used. The UE mayconfigure rate matching based, at least in some aspects, on the subsetof SSBs indicated by the bitmap as well as the indicated maximum numberof SSBs available for use. In some aspects, this may include the UEhaving a rule or otherwise repeating the pattern of actually transmittedSSBs (e.g., the subset of SSBs within the set of SSBs) and the puncturedSSB positions within the set of SSBs for the used SSB positions, e.g.,the UE may repeat the pattern “10101010” for the SSB positions 8 throughthe end of the maximum number of SSBs available for use. Accordingly,the UE may receive a data transmission (e.g., a physical downlink sharedchannel (PDSCH)) transmission using the configured rate matching.

A method of wireless communication at a UE is described. The method mayinclude receiving, from a base station, a SSB of a set of QCL SSBs, theSSB including an indication of a parameter indicating informationassociated with a set of downlink control channel locationscorresponding to the set of QCL SSBs, determining, based on theparameter, the set of downlink control channel locations correspondingto the set of QCL SSBs, receiving a downlink grant for a systeminformation based on monitoring one or more downlink control channellocations of the set of downlink control channel locations, receivingthe system information based on the downlink grant, and establishing aconnection with the base station based on the SSB and the receivedsystem information.

An apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory in electronic communicationwith the processor, and instructions stored in the memory. Theinstructions may be executable by the processor to cause the apparatusto receive, from a base station, a SSB of a set of QCL SSBs, the SSBincluding an indication of a parameter indicating information associatedwith a set of downlink control channel locations corresponding to theset of QCL SSBs, determine, based on the parameter, the set of downlinkcontrol channel locations corresponding to the set of QCL SSBs, receivea downlink grant for a system information based on monitoring one ormore downlink control channel locations of the set of downlink controlchannel locations, receive the system information based on the downlinkgrant, and establish a connection with the base station based on the SSBand the received system information.

Another apparatus for wireless communication at a UE is described. Theapparatus may include means for receiving, from a base station, a SSB ofa set of QCL SSBs, the SSB including an indication of a parameterindicating information associated with a set of downlink control channellocations corresponding to the set of QCL SSBs, determining, based onthe parameter, the set of downlink control channel locationscorresponding to the set of QCL SSBs, receiving a downlink grant for asystem information based on monitoring one or more downlink controlchannel locations of the set of downlink control channel locations,receiving the system information based on the downlink grant, andestablishing a connection with the base station based on the SSB and thereceived system information.

A non-transitory computer-readable medium storing code for wirelesscommunication at a UE is described. The code may include instructionsexecutable by a processor to receive, from a base station, a SSB of aset of QCL SSBs, the SSB including an indication of a parameterindicating information associated with a set of downlink control channellocations corresponding to the set of QCL SSBs, determine, based on theparameter, the set of downlink control channel locations correspondingto the set of QCL SSBs, receive a downlink grant for a systeminformation based on monitoring one or more downlink control channellocations of the set of downlink control channel locations, receive thesystem information based on the downlink grant, and establish aconnection with the base station based on the SSB and the receivedsystem information.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the parameter includes anindication of offset between successive SSBs within the set of QCL SSBs.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the SSB may includeoperations, features, means, or instructions for receiving a PBCHportion of the SSB, the PBCH portion of the SSB including the indicationof the parameter.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the PBCH portion ofthe synchronization block may include operations, features, means, orinstructions for performing soft combining across a set of SSBs.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the indication of theparameter may be common across each SSB of the set of SSBs.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the set of SSBs include atleast one of the set of QCL SSBs, a set of different sets of QCL SSBs,each SSB associated with the base station, or a combination thereof.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining an index ofeach SSB of the set of QCL SSBs, and where determining the set ofdownlink control channel locations may be based on the determined indexof each SSB of the set of QCL SSBs.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining the set ofdownlink control channel locations may be based on a frame in which theSSB may be received and the parameter indicated in the SSB.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the downlink grantmay include operations, features, means, or instructions for monitoringeach downlink control channel location of the set of downlink controlchannel locations.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the downlink grantmay include operations, features, means, or instructions for determiningthat no downlink control information was detected during a firstinstance of the set of downlink control channel locations, andmonitoring, based on the parameter, a second instance of the set ofdownlink control channel locations to detect the downlink grant.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the downlink control channellocations of the set of downlink control channel locations include type0 PDCCH common search spaces.

A method of wireless communication at a base station is described. Themethod may include transmitting a set of SSBs, the set of SSBs includinga set of QCL SSBs, where each SSB of the set of SSBs includes anindication of a parameter indicating information associated with a setof downlink control channel locations corresponding to the set of QCLSSBs, transmitting, based on the parameter, a downlink grant for asystem information over the set of downlink control channel locationscorresponding to the set of QCL SSBs, transmitting the systeminformation according to the grant, and establishing a connection with aUE based on the SSB and the system information.

An apparatus for wireless communication at a base station is described.The apparatus may include a processor, memory in electroniccommunication with the processor, and instructions stored in the memory.The instructions may be executable by the processor to cause theapparatus to transmit a set of SSBs, the set of SSBs including a set ofQCL SSBs, where each SSB of the set of SSBs includes an indication of aparameter indicating information associated with a set of downlinkcontrol channel locations corresponding to the set of QCL SSBs,transmit, based on the parameter, a downlink grant for a systeminformation over the set of downlink control channel locationscorresponding to the set of QCL SSBs, transmit the system informationaccording to the grant, and establish a connection with a UE based onthe SSB and the system information.

Another apparatus for wireless communication at a base station isdescribed. The apparatus may include means for transmitting a set ofSSBs, the set of SSBs including a set of QCL SSBs, where each SSB of theset of SSBs includes an indication of a parameter indicating informationassociated with a set of downlink control channel locationscorresponding to the set of QCL SSBs, transmitting, based on theparameter, a downlink grant for a system information over the set ofdownlink control channel locations corresponding to the set of QCL SSBs,transmitting the system information according to the grant, andestablishing a connection with a UE based on the SSB and the systeminformation.

A non-transitory computer-readable medium storing code for wirelesscommunication at a base station is described. The code may includeinstructions executable by a processor to transmit a set of SSBs, theset of SSBs including a set of QCL SSBs, where each SSB of the set ofSSBs includes an indication of a parameter indicating informationassociated with a set of downlink control channel locationscorresponding to the set of QCL SSBs, transmit, based on the parameter,a downlink grant for a system information over the set of downlinkcontrol channel locations corresponding to the set of QCL SSBs, transmitthe system information according to the grant, and establish aconnection with a UE based on the SSB and the system information.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the parameter includes anindication of an offset between successive SSBs within the set of QCLSSBs.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the set of SSBsmay include operations, features, means, or instructions fortransmitting a PBCH portion of the SSB, the physical broadcast portionof the SSB including the indication of the parameter.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the indication of theparameter may be common across each SSB of the set of SSBs.

A method of wireless communication at a UE is described. The method mayinclude receiving a system information including a bitmap indicating asubset of SSBs transmitted from a set of SSBs, the system informationsignal further indicating a maximum number of SSBs available for use,where the maximum number of SSBs available for use is greater than atotal number of SSBs in the set of SSBs, configuring rate matching basedon the subset of SSBs indicated by the bitmap and the indicated maximumnumber of SSBs available for use, and receiving a PDSCH transmissionbased on the rate matching.

An apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory in electronic communicationwith the processor, and instructions stored in the memory. Theinstructions may be executable by the processor to cause the apparatusto receive a system information including a bitmap indicating a subsetof SSBs transmitted from a set of SSBs, the system information signalfurther indicating a maximum number of SSBs available for use, where themaximum number of SSBs available for use is greater than a total numberof SSBs in the set of SSBs, configure rate matching based on the subsetof SSBs indicated by the bitmap and the indicated maximum number of SSBsavailable for use, and receive a PDSCH transmission based on the ratematching.

Another apparatus for wireless communication at a UE is described. Theapparatus may include means for receiving a system information includinga bitmap indicating a subset of SSBs transmitted from a set of SSBs, thesystem information signal further indicating a maximum number of SSBsavailable for use, where the maximum number of SSBs available for use isgreater than a total number of SSBs in the set of SSBs, configuring ratematching based on the subset of SSBs indicated by the bitmap and theindicated maximum number of SSBs available for use, and receiving aPDSCH transmission based on the rate matching.

A non-transitory computer-readable medium storing code for wirelesscommunication at a UE is described. The code may include instructionsexecutable by a processor to receive a system information including abitmap indicating a subset of SSBs transmitted from a set of SSBs, thesystem information signal further indicating a maximum number of SSBsavailable for use, where the maximum number of SSBs available for use isgreater than a total number of SSBs in the set of SSBs, configure ratematching based on the subset of SSBs indicated by the bitmap and theindicated maximum number of SSBs available for use, and receive a PDSCHtransmission based on the rate matching.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, configuring rate matching mayinclude operations, features, means, or instructions for repeating apattern in the bitmap for the subset of SSBs within the set of SSBs andfor SSBs occurring after the subset of SSBs and within the maximumnumber of SSBs available for use.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the systeminformation may include operations, features, means, or instructions forreceiving a previous PDSCH transmission including the systeminformation, and decoding the system information to identify the bitmap,where rate matching may be not performed on the previous PDSCH.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the PDSCH transmission may bereceived during a same discovery period in which the maximum number ofSSBs may be transmitted available for use.

A method of wireless communication at a base station is described. Themethod may include transmitting a system information including a bitmapindicating a subset of SSBs transmitted from a set of SSBs, the systeminformation further indicating a maximum number of SSBs available foruse, where the maximum number of SSBs available for use is greater thana total number of SSBs in the set of SSBs, configuring rate matchingbased on the subset of SSBs indicated by the bitmap and the indicatedmaximum number of SSBs available for use, and performing a PDSCHtransmission based on the rate matching.

An apparatus for wireless communication at a base station is described.The apparatus may include a processor, memory in electroniccommunication with the processor, and instructions stored in the memory.The instructions may be executable by the processor to cause theapparatus to transmit a system information including a bitmap indicatinga subset of SSBs transmitted from a set of SSBs, the system informationfurther indicating a maximum number of SSBs available for use, where themaximum number of SSBs available for use is greater than a total numberof SSBs in the set of SSBs, configure rate matching based on the subsetof SSBs indicated by the bitmap and the indicated maximum number of SSBsavailable for use, and perform a PDSCH transmission based on the ratematching.

Another apparatus for wireless communication at a base station isdescribed. The apparatus may include means for transmitting a systeminformation including a bitmap indicating a subset of SSBs transmittedfrom a set of SSBs, the system information further indicating a maximumnumber of SSBs available for use, where the maximum number of SSBsavailable for use is greater than a total number of SSBs in the set ofSSBs, configuring rate matching based on the subset of SSBs indicated bythe bitmap and the indicated maximum number of SSBs available for use,and performing a PDSCH transmission based on the rate matching.

A non-transitory computer-readable medium storing code for wirelesscommunication at a base station is described. The code may includeinstructions executable by a processor to transmit a system informationincluding a bitmap indicating a subset of SSBs transmitted from a set ofSSBs, the system information further indicating a maximum number of SSBsavailable for use, where the maximum number of SSBs available for use isgreater than a total number of SSBs in the set of SSBs, configure ratematching based on the subset of SSBs indicated by the bitmap and theindicated maximum number of SSBs available for use, and perform a PDSCHtransmission based on the rate matching.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for repeating a pattern inthe bitmap for transmitting the subset of SSBs within the set of SSBsand for a set of additional SSBs transmitted after the subset of SSBsand within the maximum number of SSBs available for use.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the systeminformation may include operations, features, means, or instructions forperforming a previous PDSCH transmission including the systeminformation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationsthat supports control search space overlap indication in accordance withaspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communication system thatsupports control search space overlap indication in accordance withaspects of the present disclosure.

FIG. 3 illustrates an example of a SSB configuration that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure.

FIGS. 4A and 4B illustrate examples of a SSB configuration that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure.

FIG. 5 illustrates an example of a process that supports control searchspace overlap indication in accordance with aspects of the presentdisclosure.

FIG. 6 illustrates an example of a process that supports control searchspace overlap indication in accordance with aspects of the presentdisclosure.

FIGS. 7 and 8 show block diagrams of devices that support control searchspace overlap indication in accordance with aspects of the presentdisclosure.

FIG. 9 shows a block diagram of a communications manager that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure.

FIG. 10 shows a diagram of a system including a device that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure.

FIGS. 11 and 12 show block diagrams of devices that support controlsearch space overlap indication in accordance with aspects of thepresent disclosure.

FIG. 13 shows a block diagram of a communications manager that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure.

FIG. 14 shows a diagram of a system including a device that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure.

FIGS. 15 through 18 show flowcharts illustrating methods that supportcontrol search space overlap indication in accordance with aspects ofthe present disclosure.

DETAILED DESCRIPTION

Wireless communication systems typically support a variety ofcommunication techniques to support wireless communications between abase station and a user equipment (UE). For example, a base station maytransmit a variety of synchronization signals (e.g., synchronizationsignal blocks (SSBs)) to support acquisition by UEs. Generally, the SSBsmay carry or convey various parameters associated with the base stationthat the UE uses to align (in time, frequency, and the like) with thebase station, at least to some degree, in order to establish aconnection between the base station and the UE. Conventionally, alimited or defined number of SSBs are typically transmitted by the basestation. In a millimeter wave (mmW) network, the base station maytransmit the SSBs in beamformed transmissions in a sweeping manneraround the coverage area of the base station.

Conventionally, the limited or defined number of SSBs available fortransmission supported a one-to-one mapping between the SSBs and variouscontrol signal resources. For example, each SSB may have a correspondingset of control signal (e.g., physical downlink control channel (PDCCH))resources associated with it, e.g., an index number for the SSB maycorrespond to a particular PDCCH resource. However, conventionaltechniques do not support a configuration were additional SSBs may beused for transmission and some SSBs may not be transmitted due to theoutcome of a listen-before-talk (LBT) procedure on a carrier whichrequires an LBT procedure to be performed before transmission, e.g., maynot provide a mechanism that supports an indication of PDCCH searchspace overlap. Accordingly, in the situation where additional SSBs areavailable transmission, conventional wireless networks may not supportmapping a plurality of SSBs to a particular control channel resource.

Aspects of the disclosure are initially described in the context of awireless communications system. The described techniques relate toimproved methods, systems, devices, and apparatuses that support controlsearch space overlap indication. Generally, the described techniquesprovide for various mechanisms that improve indicating overlappingcontrol channel locations corresponding to a set of quasi-co-located(QCL) synchronization signal blocks (SSBs). For example, a base stationmay transmit a plurality of SSBs from a set of QCL SSBs. The SSBsselected for transmission from the set of QCL SSBs may be based on theresults of an LBT procedure. In some aspects, each of the SSBs withinthe plurality of SSBs carry or otherwise convey an indication of anoffset between successive SSBs within the set of QCL SSBs. Broadly, theoffset may refer to a parameter carried or conveyed in the SSB (e.g., aphysical broadcast channel (PBCH) portion of the SSB) that allows orotherwise supports the control channel location overlapping fordifferent SSBs. A UE may receive one of the SSBs transmitted from thebase station and determine the indicated offset. Based on this offset,the UE may determine a plurality of downlink control channel locations(e.g., physical downlink control channel (PDCCH) locations) thatcorrespond to the set of QCL SSBs. The UE may use the determineddownlink control channel locations to receive a downlink grant for asystem information signal (e.g., a remaining minimum system information(RMSI)), e.g., by monitoring the downlink control channel locations. TheUE may receive the system information according to the downlink grantand use the information in the system information (e.g., RMSI) as wellas the SSB to establish a connection with the base station.

In other aspects, the described techniques may support rate matchingoperations of the UE. For example, the system information (e.g., RMSI)may carry or convey a bitmap that indicates a subset of SSBs that areactually being transmitted from a set of SSBs, e.g., the bits within thebitmap may be set to “1” to indicate that an SSB is transmitted in thatlocation, or vice versa. In some aspects, the system information mayadditionally carry or convey an indication of a maximum number of SSBsavailable for use that is greater than the total number of SSBs in theset of SSBs. For example, the bitmap may be configured as “10101010” toindicate that SSB positions 0, 2, 4, and 6 are actually beingtransmitted within a set of SSBs consisting of SSB positions (orindices) 0-7. The indication of the maximum number of SSBs may be set tothe number of the maximum SSB position being used, e.g., 12, 16, 18, orsome other number of maximum SSB positions that may be used. The UE mayconfigure rate matching based, at least in some aspects, on the subsetof SSBs indicated by the bitmap as well as the indicated maximum numberof SSBs available for use. In some aspects, this may include the UEhaving a rule or otherwise repeating the pattern of actually transmittedSSBs (e.g., the subset of SSBs within the set of SSBs) and the puncturedSSB positions within the set of SSBs for the used SSB positions, e.g.,the UE may repeat the pattern “10101010” for the SSB positions 8 throughthe end of the maximum number of SSBs available for use. Accordingly,the UE may receive a data transmission (e.g., a physical downlink sharedchannel (PDSCH)) transmission using the configured rate matching.

Aspects of the disclosure are further illustrated by and described withreference to apparatus diagrams, system diagrams, and flowcharts thatrelate to control search space overlap indication.

FIG. 1 illustrates an example of a wireless communications system 100that supports control search space overlap indication in accordance withaspects of the present disclosure. The wireless communications system100 includes base stations 105, UEs 115, and a core network 130. In someexamples, the wireless communications system 100 may be a Long TermEvolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pronetwork, or a New Radio (NR) network. In some cases, wirelesscommunications system 100 may support enhanced broadband communications,ultra-reliable (e.g., mission critical) communications, low latencycommunications, or communications with low-cost and low-complexitydevices.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Base stations 105 described herein mayinclude or may be referred to by those skilled in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB orgiga-NodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or some other suitable terminology. Wirelesscommunications system 100 may include base stations 105 of differenttypes (e.g., macro or small cell base stations). The UEs 115 describedherein may be able to communicate with various types of base stations105 and network equipment including macro eNBs, small cell eNBs, gNBs,relay base stations, and the like.

Each base station 105 may be associated with a particular geographiccoverage area 110 in which communications with various UEs 115 issupported. Each base station 105 may provide communication coverage fora respective geographic coverage area 110 via communication links 125,and communication links 125 between a base station 105 and a UE 115 mayutilize one or more carriers. Communication links 125 shown in wirelesscommunications system 100 may include uplink transmissions from a UE 115to a base station 105, or downlink transmissions from a base station 105to a UE 115. Downlink transmissions may also be called forward linktransmissions while uplink transmissions may also be called reverse linktransmissions.

The geographic coverage area 110 for a base station 105 may be dividedinto sectors making up a portion of the geographic coverage area 110,and each sector may be associated with a cell. For example, each basestation 105 may provide communication coverage for a macro cell, a smallcell, a hot spot, or other types of cells, or various combinationsthereof. In some examples, a base station 105 may be movable andtherefore provide communication coverage for a moving geographiccoverage area 110. In some examples, different geographic coverage areas110 associated with different technologies may overlap, and overlappinggeographic coverage areas 110 associated with different technologies maybe supported by the same base station 105 or by different base stations105. The wireless communications system 100 may include, for example, aheterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different typesof base stations 105 provide coverage for various geographic coverageareas 110.

The term “cell” refers to a logical communication entity used forcommunication with a base station 105 (e.g., over a carrier), and may beassociated with an identifier for distinguishing neighboring cells(e.g., a physical cell identifier (PCID), a virtual cell identifier(VCID)) operating via the same or a different carrier. In some examples,a carrier may support multiple cells, and different cells may beconfigured according to different protocol types (e.g., machine-typecommunication (MTC), narrowband Internet-of-Things (NB-IoT), enhancedmobile broadband (eMBB), or others) that may provide access fordifferent types of devices. In some cases, the term “cell” may refer toa portion of a geographic coverage area 110 (e.g., a sector) over whichthe logical entity operates.

UEs 115 may be dispersed throughout the wireless communications system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile device, a wireless device, a remote device, ahandheld device, or a subscriber device, or some other suitableterminology, where the “device” may also be referred to as a unit, astation, a terminal, or a client. A UE 115 may also be a personalelectronic device such as a cellular phone, a personal digital assistant(PDA), a tablet computer, a laptop computer, or a personal computer. Insome examples, a UE 115 may also refer to a wireless local loop (WLL)station, an Internet of Things (IoT) device, an Internet of Everything(IoE) device, or an MTC device, or the like, which may be implemented invarious articles such as appliances, vehicles, meters, or the like.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices, and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay that information to acentral server or application program that can make use of theinformation or present the information to humans interacting with theprogram or application. Some UEs 115 may be designed to collectinformation or enable automated behavior of machines. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (e.g., a mode thatsupports one-way communication via transmission or reception, but nottransmission and reception simultaneously). In some examples half-duplexcommunications may be performed at a reduced peak rate. Other powerconservation techniques for UEs 115 include entering a power saving“deep sleep” mode when not engaging in active communications, oroperating over a limited bandwidth (e.g., according to narrowbandcommunications). In some cases, UEs 115 may be designed to supportcritical functions (e.g., mission critical functions), and a wirelesscommunications system 100 may be configured to provide ultra-reliablecommunications for these functions.

In some cases, a UE 115 may also be able to communicate directly withother UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device(D2D) protocol). One or more of a group of UEs 115 utilizing D2Dcommunications may be within the geographic coverage area 110 of a basestation 105. Other UEs 115 in such a group may be outside the geographiccoverage area 110 of a base station 105, or be otherwise unable toreceive transmissions from a base station 105. In some cases, groups ofUEs 115 communicating via D2D communications may utilize a one-to-many(1:M) system in which each UE 115 transmits to every other UE 115 in thegroup. In some cases, a base station 105 facilitates the scheduling ofresources for D2D communications. In other cases, D2D communications arecarried out between UEs 115 without the involvement of a base station105.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., via an S1, N2, N3, orother interface). Base stations 105 may communicate with one anotherover backhaul links 134 (e.g., via an X2, Xn, or other interface) eitherdirectly (e.g., directly between base stations 105) or indirectly (e.g.,via core network 130).

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC), which may include at least one mobilitymanagement entity (MME), at least one serving gateway (S-GW), and atleast one Packet Data Network (PDN) gateway (P-GW). The MME may managenon-access stratum (e.g., control plane) functions such as mobility,authentication, and bearer management for UEs 115 served by basestations 105 associated with the EPC. User IP packets may be transferredthrough the S-GW, which itself may be connected to the P-GW. The P-GWmay provide IP address allocation as well as other functions. The P-GWmay be connected to the network operators IP services. The operators IPservices may include access to the Internet, Intranet(s), an IPMultimedia Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.

At least some of the network devices, such as a base station 105, mayinclude subcomponents such as an access network entity, which may be anexample of an access node controller (ANC). Each access network entitymay communicate with UEs 115 through a number of other access networktransmission entities, which may be referred to as a radio head, a smartradio head, or a transmission/reception point (TRP). In someconfigurations, various functions of each access network entity or basestation 105 may be distributed across various network devices (e.g.,radio heads and access network controllers) or consolidated into asingle network device (e.g., a base station 105).

Wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 megahertz (MHz) to 300gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known asthe ultra-high frequency (UHF) region or decimeter band, since thewavelengths range from approximately one decimeter to one meter inlength. UHF waves may be blocked or redirected by buildings andenvironmental features. However, the waves may penetrate structuressufficiently for a macro cell to provide service to UEs 115 locatedindoors. Transmission of UHF waves may be associated with smallerantennas and shorter range (e.g., less than 100 km) compared totransmission using the smaller frequencies and longer waves of the highfrequency (HF) or very high frequency (VHF) portion of the spectrumbelow 300 MHz.

Wireless communications system 100 may also operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band. The SHF region includes bands such as the5 GHz industrial, scientific, and medical (ISM) bands, which may be usedopportunistically by devices that may be capable of toleratinginterference from other users.

Wireless communications system 100 may also operate in an extremely highfrequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz),also known as the millimeter band. In some examples, wirelesscommunications system 100 may support millimeter wave (mmW)communications between UEs 115 and base stations 105, and EHF antennasof the respective devices may be even smaller and more closely spacedthan UHF antennas. In some cases, this may facilitate use of antennaarrays within a UE 115. However, the propagation of EHF transmissionsmay be subject to even greater atmospheric attenuation and shorter rangethan SHF or UHF transmissions. Techniques disclosed herein may beemployed across transmissions that use one or more different frequencyregions, and designated use of bands across these frequency regions maydiffer by country or regulating body.

In some cases, wireless communications system 100 may utilize bothlicensed and unlicensed radio frequency spectrum bands. For example,wireless communications system 100 may employ License Assisted Access(LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technologyin an unlicensed band such as the 5 GHz ISM band. When operating inunlicensed radio frequency spectrum bands, wireless devices such as basestations 105 and UEs 115 may employ listen-before-talk (LBT) proceduresto ensure a frequency channel is clear before transmitting data. In somecases, operations in unlicensed bands may be based on a carrieraggregation configuration in conjunction with component carriersoperating in a licensed band (e.g., LAA). Operations in unlicensedspectrum may include downlink transmissions, uplink transmissions,peer-to-peer transmissions, or a combination of these. Duplexing inunlicensed spectrum may be based on frequency division duplexing (FDD),time division duplexing (TDD), or a combination of both.

In some examples, base station 105 or UE 115 may be equipped withmultiple antennas, which may be used to employ techniques such astransmit diversity, receive diversity, multiple-input multiple-output(MIMO) communications, or beamforming. For example, wirelesscommunications system 100 may use a transmission scheme between atransmitting device (e.g., a base station 105) and a receiving device(e.g., a UE 115), where the transmitting device is equipped withmultiple antennas and the receiving device is equipped with one or moreantennas. MIMO communications may employ multipath signal propagation toincrease the spectral efficiency by transmitting or receiving multiplesignals via different spatial layers, which may be referred to asspatial multiplexing. The multiple signals may, for example, betransmitted by the transmitting device via different antennas ordifferent combinations of antennas. Likewise, the multiple signals maybe received by the receiving device via different antennas or differentcombinations of antennas. Each of the multiple signals may be referredto as a separate spatial stream, and may carry bits associated with thesame data stream (e.g., the same codeword) or different data streams.Different spatial layers may be associated with different antenna portsused for channel measurement and reporting. MIMO techniques includesingle-user MIMO (SU-MIMO) where multiple spatial layers are transmittedto the same receiving device, and multiple-user MIMO (MU-MIMO) wheremultiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105 or a UE 115) to shape orsteer an antenna beam (e.g., a transmit beam or receive beam) along aspatial path between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that signals propagating atparticular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying certain amplitude and phase offsets to signals carried via eachof the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

In one example, a base station 105 may use multiple antennas or antennaarrays to conduct beamforming operations for directional communicationswith a UE 115. For instance, some signals (e.g. synchronization signals,reference signals, beam selection signals, or other control signals) maybe transmitted by a base station 105 multiple times in differentdirections, which may include a signal being transmitted according todifferent beamforming weight sets associated with different directionsof transmission. Transmissions in different beam directions may be usedto identify (e.g., by the base station 105 or a receiving device, suchas a UE 115) a beam direction for subsequent transmission and/orreception by the base station 105.

Some signals, such as data signals associated with a particularreceiving device, may be transmitted by a base station 105 in a singlebeam direction (e.g., a direction associated with the receiving device,such as a UE 115). In some examples, the beam direction associated withtransmissions along a single beam direction may be determined based atleast in part on a signal that was transmitted in different beamdirections. For example, a UE 115 may receive one or more of the signalstransmitted by the base station 105 in different directions, and the UE115 may report to the base station 105 an indication of the signal itreceived with a highest signal quality, or an otherwise acceptablesignal quality. Although these techniques are described with referenceto signals transmitted in one or more directions by a base station 105,a UE 115 may employ similar techniques for transmitting signals multipletimes in different directions (e.g., for identifying a beam directionfor subsequent transmission or reception by the UE 115), or transmittinga signal in a single direction (e.g., for transmitting data to areceiving device).

A receiving device (e.g., a UE 115, which may be an example of a mmWreceiving device) may try multiple receive beams when receiving varioussignals from the base station 105, such as synchronization signals,reference signals, beam selection signals, or other control signals. Forexample, a receiving device may try multiple receive directions byreceiving via different antenna subarrays, by processing receivedsignals according to different antenna subarrays, by receiving accordingto different receive beamforming weight sets applied to signals receivedat a plurality of antenna elements of an antenna array, or by processingreceived signals according to different receive beamforming weight setsapplied to signals received at a plurality of antenna elements of anantenna array, any of which may be referred to as “listening” accordingto different receive beams or receive directions. In some examples areceiving device may use a single receive beam to receive along a singlebeam direction (e.g., when receiving a data signal). The single receivebeam may be aligned in a beam direction determined based at least inpart on listening according to different receive beam directions (e.g.,a beam direction determined to have a highest signal strength, highestsignal-to-noise ratio, or otherwise acceptable signal quality based atleast in part on listening according to multiple beam directions).

In some cases, the antennas of a base station 105 or UE 115 may belocated within one or more antenna arrays, which may support MIMOoperations, or transmit or receive beamforming. For example, one or morebase station antennas or antenna arrays may be co-located at an antennaassembly, such as an antenna tower. In some cases, antennas or antennaarrays associated with a base station 105 may be located in diversegeographic locations. A base station 105 may have an antenna array witha number of rows and columns of antenna ports that the base station 105may use to support beamforming of communications with a UE 115.Likewise, a UE 115 may have one or more antenna arrays that may supportvarious MIMO or beamforming operations.

In some cases, wireless communications system 100 may be a packet-basednetwork that operate according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer mayperform packet segmentation and reassembly to communicate over logicalchannels. A Medium Access Control (MAC) layer may perform priorityhandling and multiplexing of logical channels into transport channels.The MAC layer may also use hybrid automatic repeat request (HARQ) toprovide retransmission at the MAC layer to improve link efficiency. Inthe control plane, the Radio Resource Control (RRC) protocol layer mayprovide establishment, configuration, and maintenance of an RRCconnection between a UE 115 and a base station 105 or core network 130supporting radio bearers for user plane data. At the Physical layer,transport channels may be mapped to physical channels.

In some cases, UEs 115 and base stations 105 may support retransmissionsof data to increase the likelihood that data is received successfully.HARQ feedback is one technique of increasing the likelihood that data isreceived correctly over a communication link 125. HARQ may include acombination of error detection (e.g., using a cyclic redundancy check(CRC)), forward error correction (FEC), and retransmission (e.g.,automatic repeat request (ARQ)). HARQ may improve throughput at the MAClayer in poor radio conditions (e.g., signal-to-noise conditions). Insome cases, a wireless device may support same-slot HARQ feedback, wherethe device may provide HARQ feedback in a specific slot for datareceived in a previous symbol in the slot. In other cases, the devicemay provide HARQ feedback in a subsequent slot, or according to someother time interval.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit, which may, for example, refer to a sampling period ofT_(s)=1/30,720,000 seconds. Time intervals of a communications resourcemay be organized according to radio frames each having a duration of 10milliseconds (ms), where the frame period may be expressed asT_(f)=307,200 T_(s). The radio frames may be identified by a systemframe number (SFN) ranging from 0 to 1023. Each frame may include 10subframes numbered from 0 to 9, and each subframe may have a duration of1 ms. A subframe may be further divided into 2 slots each having aduration of 0.5 ms, and each slot may contain 6 or 7 modulation symbolperiods (e.g., depending on the length of the cyclic prefix prepended toeach symbol period). Excluding the cyclic prefix, each symbol period maycontain 2048 sampling periods. In some cases, a subframe may be thesmallest scheduling unit of the wireless communications system 100, andmay be referred to as a transmission time interval (TTI). In othercases, a smallest scheduling unit of the wireless communications system100 may be shorter than a subframe or may be dynamically selected (e.g.,in bursts of shortened TTIs (sTTIs) or in selected component carriersusing sTTIs).

In some wireless communications systems, a slot may further be dividedinto multiple mini-slots containing one or more symbols. In someinstances, a symbol of a mini-slot or a mini-slot may be the smallestunit of scheduling. Each symbol may vary in duration depending on thesubcarrier spacing or frequency band of operation, for example. Further,some wireless communications systems may implement slot aggregation inwhich multiple slots or mini-slots are aggregated together and used forcommunication between a UE 115 and a base station 105.

The term “carrier” refers to a set of radio frequency spectrum resourceshaving a defined physical layer structure for supporting communicationsover a communication link 125. For example, a carrier of a communicationlink 125 may include a portion of a radio frequency spectrum band thatis operated according to physical layer channels for a given radioaccess technology. Each physical layer channel may carry user data,control information, or other signaling. A carrier may be associatedwith a pre-defined frequency channel (e.g., an evolved universal mobiletelecommunication system terrestrial radio access (E-UTRA) absoluteradio frequency channel number (EARFCN)), and may be positionedaccording to a channel raster for discovery by UEs 115. Carriers may bedownlink or uplink (e.g., in an FDD mode), or be configured to carrydownlink and uplink communications (e.g., in a TDD mode). In someexamples, signal waveforms transmitted over a carrier may be made up ofmultiple sub-carriers (e.g., using multi-carrier modulation (MCM)techniques such as orthogonal frequency division multiplexing (OFDM) ordiscrete Fourier transform spread OFDM (DFT-S-OFDM)).

The organizational structure of the carriers may be different fordifferent radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR).For example, communications over a carrier may be organized according toTTIs or slots, each of which may include user data as well as controlinformation or signaling to support decoding the user data. A carriermay also include dedicated acquisition signaling (e.g., synchronizationsignals or system information, etc.) and control signaling thatcoordinates operation for the carrier. In some examples (e.g., in acarrier aggregation configuration), a carrier may also have acquisitionsignaling or control signaling that coordinates operations for othercarriers.

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, controlinformation transmitted in a physical control channel may be distributedbetween different control regions in a cascaded manner (e.g., between acommon control region or common search space and one or more UE-specificcontrol regions or UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of predetermined bandwidths for carriers of a particularradio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Insome examples, each served UE 115 may be configured for operating overportions or all of the carrier bandwidth. In other examples, some UEs115 may be configured for operation using a narrowband protocol typethat is associated with a predefined portion or range (e.g., set ofsubcarriers or RBs) within a carrier (e.g., “in-band” deployment of anarrowband protocol type).

In a system employing MCM techniques, a resource element may consist ofone symbol period (e.g., a duration of one modulation symbol) and onesubcarrier, where the symbol period and subcarrier spacing are inverselyrelated. The number of bits carried by each resource element may dependon the modulation scheme (e.g., the order of the modulation scheme).Thus, the more resource elements that a UE 115 receives and the higherthe order of the modulation scheme, the higher the data rate may be forthe UE 115. In MIMO systems, a wireless communications resource mayrefer to a combination of a radio frequency spectrum resource, a timeresource, and a spatial resource (e.g., spatial layers), and the use ofmultiple spatial layers may further increase the data rate forcommunications with a UE 115.

Devices of the wireless communications system 100 (e.g., base stations105 or UEs 115) may have a hardware configuration that supportscommunications over a particular carrier bandwidth, or may beconfigurable to support communications over one of a set of carrierbandwidths. In some examples, the wireless communications system 100 mayinclude base stations 105 and/or UEs 115 that support simultaneouscommunications via carriers associated with more than one differentcarrier bandwidth.

Wireless communications system 100 may support communication with a UE115 on multiple cells or carriers, a feature which may be referred to ascarrier aggregation or multi-carrier operation. A UE 115 may beconfigured with multiple downlink component carriers and one or moreuplink component carriers according to a carrier aggregationconfiguration. Carrier aggregation may be used with both FDD and TDDcomponent carriers.

In some cases, wireless communications system 100 may utilize enhancedcomponent carriers (eCCs). An eCC may be characterized by one or morefeatures including wider carrier or frequency channel bandwidth, shortersymbol duration, shorter TTI duration, or modified control channelconfiguration. In some cases, an eCC may be associated with a carrieraggregation configuration or a dual connectivity configuration (e.g.,when multiple serving cells have a suboptimal or non-ideal backhaullink). An eCC may also be configured for use in unlicensed spectrum orshared spectrum (e.g., where more than one operator is allowed to usethe spectrum). An eCC characterized by wide carrier bandwidth mayinclude one or more segments that may be utilized by UEs 115 that arenot capable of monitoring the whole carrier bandwidth or are otherwiseconfigured to use a limited carrier bandwidth (e.g., to conserve power).

In some cases, an eCC may utilize a different symbol duration than othercomponent carriers, which may include use of a reduced symbol durationas compared with symbol durations of the other component carriers. Ashorter symbol duration may be associated with increased spacing betweenadjacent subcarriers. A device, such as a UE 115 or base station 105,utilizing eCCs may transmit wideband signals (e.g., according tofrequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc.) atreduced symbol durations (e.g., 16.67 microseconds). A TTI in eCC mayconsist of one or multiple symbol periods. In some cases, the TTIduration (that is, the number of symbol periods in a TTI) may bevariable.

Wireless communications system 100 may be an NR system that may utilizeany combination of licensed, shared, and unlicensed spectrum bands,among others. The flexibility of eCC symbol duration and subcarrierspacing may allow for the use of eCC across multiple spectrums. In someexamples, NR shared spectrum may increase spectrum utilization andspectral efficiency, specifically through dynamic vertical (e.g., acrossthe frequency domain) and horizontal (e.g., across the time domain)sharing of resources.

In some aspects, a UE 115 may receive, from a base station 105, a SSB ofa set of QCL SSBs, the SSB comprising an indication of a parameterindicating information associated with a plurality of downlink controlchannel locations corresponding to the set of QCL SSBs. The UE 115 maydetermine, based at least in part on the parameter, the plurality ofdownlink control channel locations corresponding to the set of QCL SSBs.The UE 115 may receive a downlink grant for a system information basedat least in part on monitoring one or more downlink control channellocations of the plurality of downlink control channel locations. The UE115 may receive the system information based at least in part on thedownlink grant. The UE 115 may establish a connection with the basestation 105 based at least in part on the SSB and the received systeminformation block.

In some aspects, a base station 105 may transmit a plurality of SSBs,the plurality of SSBs comprising a set of QCL SSBs, wherein each SSB ofthe plurality of SSBs comprises an indication of a parameter indicatinginformation associated with a plurality of downlink control channellocations corresponding to the set of QCL SSBs. The base station 105 maytransmit, based at least in part on the parameter, a downlink grant fora system information over the plurality of downlink control channellocations corresponding to the set of QCL SSBs. The base station 105 maytransmit the system information according to the grant. The base station105 may establish a connection with the UE 115 based at least in part onthe synchronization signal block and the system information.

In some aspects, a UE 115 may receive a system information comprising abitmap indicating a subset of SSBs transmitted from a set of SSBs, thesystem information signal further indicating a maximum number of SSBsavailable for use, wherein the maximum number of SSBs available for useis greater than a total number of SSBs in the set of SSBs. The UE 115may configure rate matching based at least in part on the subset of SSBsindicated by the bitmap and the indicated maximum number of SSBsavailable for use. The UE 115 may receive a PDSCH transmission based atleast in part on the rate matching.

In some aspects, a base station 105 may transmit a system informationcomprising a bitmap indicating a subset of SSBs transmitted from a setof SSBs, the control signal further indicating a maximum number of SSBsavailable for use, wherein the maximum number of SSBs available for useis greater than a total number of SSBs in the set of SSBs. The basestation 105 may configure rate matching based at least in part on thesubset of SSBs indicated by the bitmap and the indicated maximum numberof SSBs being used. The base station 105 may perform a PDSCHtransmission based at least in part on the rate matching.

FIG. 2 illustrates an example of a wireless communication system 200that supports control search space overlap indication in accordance withaspects of the present disclosure. In some examples, wirelesscommunication system 200 may implement aspects of wirelesscommunications system 100. Generally, wireless communications system 200may include a base station 205 and UE 210, which may be examples ofcorresponding devices described herein. In some aspects, base station205 may be considered a potential or current serving base station fromthe perspective of UE 210.

In some aspects, wireless communication system 200 may be configured tosupport various aspects of the described techniques for control searchspace overlap indication. Generally, conventional networks typicallydefined a one-to-one correspondence between an SSB and a downlinkcontrol channel location (e.g., a PDCCH location). For example, each SSBmay have an associated index and that index may correspond to, orotherwise be associated with, a particular downlink control channellocation (e.g., such as a location of a control channel carrying a grantfor additional system information). A UE (such as UE 210) attempting toestablish a connection with base station 205 will typically monitor for,and detect an SSB having an associated index and, based on the index ofthe SSB, identify the corresponding downlink control channel location.As one non-limiting example, an initial access UE (e.g., UE 210) maydetect an SSB having an index of 5. The initial access UE may know thatSSB index 5 corresponds to a particular downlink control channellocation, e.g., based on a look-up table or some other configuredinformation. The initial access UE may monitor the downlink controlchannel location corresponding to SSB index 5 to receive a downlinkgrant for resources carrying the additional system information (e.g.,resources for a PDSCH that carries an RMSI, which may also be referredto as a RMSI PDSCH). Conventionally, the location of the downlinkcontrol channel may be carried or conveyed in a bit or field of abroadcast channel (such as a physical broadcast channel (PBCH)) of basestation 205.

However, such conventional techniques may be unusable in someconfigurations. For example, in some aspects the number of SSBs that areavailable or otherwise may be used by base station 205 may exceed thenumber of available downlink control channel locations, e.g.,accordingly the one-to-one mapping technique may be unusable. Moreover,in a mmW network base station 205 may transmit its SSBs using beamformedtransmissions that are transmitted in a sweeping manner within thecoverage area of base station 205. In some aspects, this may includebase station 205 transmitting a plurality of QCL SSBs within itscoverage area that is more than the available corresponding downlinkcontrol channel locations. However, it is to be understood that QCL SSBsare not limited to a mmW network and, instead, may refer to non-mmWnetworks.

Moreover, some wireless networks may operate in a shared or unlicensedradio frequency spectrum band where a listen-before-talk (LBT) proceduremust be performed on the channel before any transmission may occur. Inthis example, the LBT procedure performed by base station 205 may beunsuccessful for some instances of configured SSB transmission, whichmay further introduce confusion into the network.

In some aspects, the SSBs may be transmitted within a particulardiscovery period (e.g. such as a discovery reference signal (DRS)period). Again, in some instances the LBT procedure may be successfulfor some SSB transmissions within the DRS period, but unsuccessful forthe other SSB transmission instances within the DRS period. Accordingly,the configured pattern of SSB transmissions may be interrupted withinthe DRS depending upon the results of the LBT procedure, e.g., based onthe success or failure of the LBT procedure. Accordingly, aspects of thedescribed techniques provide a mechanism where the overlap (e.g.,many-to-one) relationship between multiple SSB indices correspond todownlink control channel locations may be supported by base station 205and/or UE 210.

For example, base station 205 may support a plurality of SSBs 215 beingavailable for transmission. In some aspects, this may include a set ofQCL SSBs being transmitted in beamformed transmissions in a sweepingmanner around the coverage area of base station 205. For example, afirst SSB 215-a may be transmitted in a first beamformed direction, asecond SSB 215-b may be transmitted in a second beamformed direction, athird SSB 215-c may be transmitted in a third beamformed direction, afourth SSB 215-d may be transmitted in a fourth beamformed direction, afifth SSB 215-e may be transmitted in a fifth beamformed direction, andso on. Broadly, each SSB 215 may carry or convey an indication ofcertain synchronization information usable by initial access UEs (e.g.,UE 210) that are looking for a base station to connect to. For example,each SSB 215 may carry or convey synchronization information (e.g.,timing information, frequency information, spatial information, and thelike). The initial access UE may use this information to detect orotherwise receive additional system information from base station 205 inorder to establish a connection between base station 205 and the initialaccess UE. Accordingly, base station 205 may transmit a plurality ofSSBs 215, wherein at least one of the SSBs 215 (e.g., SSB 215-d) may bedetected or otherwise received by UE 210.

In accordance with aspects of the described techniques, the SSBs 215transmitted by base station 205 may comprise or otherwise form a set ofQCL SSBs. For example, base station 205 may transmit a plurality ofinstances of the SSBs 215 within the defined period, such as a DRSperiod, within a certain number of slot(s)/frame(s), and the like. Insome aspects, the set of QCL SSBs may consist of SSBs 215 having thesame (or substantially similar) QCL configuration. For example and whenbase station 205 transmits SSBs 215 in a sweeping manner twice withinthe period, two instances of SSB 215-d may be considered a set of QCLSSBs. In the example where base station 205 transmits SSBs 215 threetimes within the period, three instances of SSB 215-d may be consideredthe set of QCL SSBs. Accordingly, base station 205 may transmit theplurality of SSBs 215 (e.g., SSBs 215-a, 215-b, 215-c, 215-d, and 215-e)in a repetitive manner such that the set of QCL SSBs 215 may includemultiple instances of the same SSB 215 being transmitted (e.g., multipleinstances of SSB 215-d). However, it is to be understood that eachinstance of the SSB 215 within the set of QCL SSBs would have its ownindex number. For example, a first instance of SSB 215-d may have anindex of 0, whereas the next instance of SSB 215-d may have an index of4 (or some other pattern). In some aspects, the SSBs 215 beingtransmitted may also have a broadcast channel, such as a physicalbroadcast channel (PBCH) portion of the SSB 215.

In some aspects, each SSB 215 being transmitted by base station 205 mayalso carry or convey an indication of a parameter that indicates orotherwise conveys information associated with the plurality of downlinkcontrol channel locations corresponding to the set of QCL SSBs. In someaspects, the parameter (e.g., parameter “X”) may allow a location of thedownlink control channel to overlap (e.g., the location of the downlinkcontrol channel may correspond to the SSB indices from the set of QCLSSBs). In some aspects, the downlink control channel may refer to atype-0 PDCCH, such as a common search space PDCCH. In some aspects, theparameter X may be an integer number that is no higher than a definedvalue (e.g., no more than 8, which may be the agreed maximum number ofSSBs 215 available for transmission). The parameter X may use three bitsto carry or convey the information. In some aspects, the parameter X maybe a subset of integer numbers and the set of values that X may take mayhave a size of 1/2/4/8 etc., (e.g., be a power of two) in order to savethe number of bits needed to convey the information. In some aspects,the parameter X may be common across all SSBs 215 being transmitted bythe base station 205. For example, the parameter X may be common acrossall PBCH and in all SSBs 215 actually transmitted. This may support UE210 using soft combining techniques for broadcast channel detection ofthe parameter. In the example where base station 205 transmits SSBs 215in beamformed transmissions, the parameter X may not necessarily be thesame as the number of beams, e.g., may be larger depending upon basestation 205 choice.

Accordingly, UE 210 (e.g., an initial access UE in this instance) mayreceive an SSB 215 (e.g. SSB 215-d) from the set of QCL SSBs (e.g.,multiple instances of SSB 215-d and/or multiple SSBs 215 having the sameor similar QCL configuration). UE 210 may recover the parameter X fromthe receive SSB and use the parameter to determine the plurality ofdownlink control channel locations corresponding to the set of QCL SSBs.As discussed, each instance of the SSB 215 may have its own associatedindex value (e.g., SSB 215 index “x”). As one example, UE 210 mayreceive SSB 215-d having an SSB index of one (e.g., x=1) and theparameter may indicate a value corresponding to the set of QCL SSBs(e.g., X=4). For downlink control channel (e.g., a PDCCH carrying agrant for an RMSI PDSCH) detection, UE 210 may search or monitor eachdownlink control channel location that corresponds to SSB z, where z modX=x mod X. In the example where x=1 and X=4, UE 210 receives orotherwise monitors downlink control channel locations (PDCCH locations)that correspond to SSB indexes of 1, 5, 9, and so on. In some aspects, aPDCCH monitoring occasion “z” may occur only in slots and radio frameson which SSBs can be potentially transmitted so the UE 210 can check tosee if the PDCCH monitoring occasion is a potential SSB slot in additionto the modulo condition z mod X=x mod X to determine whether to monitorPDCCH for control channel information during that monitoring occasion.In some aspects, the downlink control channel location may be a functionof the radio frame number, which may be determined through the PBCH andthe maximum number of SSB transmission opportunities.

Accordingly, UE 210 may detect or otherwise receive an SSB 215 havingindices of 1 and, based on the parameter X, determine the SSB indices of5, 9, and so on, are also associated with certain downlink controlchannel locations. In some aspects, the downlink control channel (e.g.RMSI PDCCH) may be transmitted in the next frame, the LBT procedure maybe independent, and the starting point may be later than x=1, and so UE210 may continue searching. This may support UE 210 being able toidentify the locations to monitor for the downlink control channel thatcorrespond to the set of QCL SSBs.

Accordingly, UE 210 may receive a downlink grant for a systeminformation (e.g., PDSCH RMSI) based on monitoring and receiving adownlink control channel (e.g., PDCCH) that carries or conveys thedownlink grant. Based on the downlink grant, UE 210 may receive thesystem information (e.g., RMSI) and establish a connection with basestation 205 according to the received SSB 215-d (in this example) andthe system information.

Another issue relating to conventional networks may relate to SSB 215rate matching. For example, in some examples of the conventionaltechniques the system information (e.g., RMSI) may carry or convey abitmap (e.g., an 8-bit bitmap) that indicates which SSBs 215 within setof the available SSBs 215 are being transmitted. For example, basestation 205 may have a set of SSBs 215 that may be transmitted (e.g.,each of SSBs 215-a through 215-e), but may actually only transmit asubset of SSBs 215 (e.g., such as SSBs 215-a, 215-c, 215-e, and so on).Conventionally, UE 210 may receive the system information in one PDSCHtransmission, and use the information indicated in the bitmap toconfigure or otherwise perform rate matching around the resourceblocks/symbols used by the indicated SSBs in subsequent PDSCHtransmissions. Such conventional techniques, however, are based on thefact that the set of and/or actually transmitted SSBs 215 are the sameacross all frames. Such conventional techniques do not support theconfiguration where the available and/or actually transmitted SSBs 215change (e.g., within a discovery period, between different frames orsets of frames, and the like). Accordingly, UE 210 may be unable toconfigure or otherwise perform rate matching in the situation where theavailable and/or actually transmitted SSBs 215 change.

Additionally, conventional techniques size the bitmap corresponding to amaximum size of available SSB transmission opportunities for a licensedcarrier where SSBs can always be transmitted. In an unlicensed carrier,where the transmissions have to undergo an LBT procedure beforetransmission, conventional techniques do not configure a much largernumber of the available SSB transmission opportunities despite the factthat many SSB transmission opportunities may not be usable at anyparticular instance due to LBT failure. Accordingly, the bitmap size maybe increased for the largest size anticipated to be used in anunlicensed system which would entail high overhead. Hence alternatesolutions are desirable.

Accordingly, aspects of the described techniques provide a mechanism(e.g., rule) that supports UE 210 being able to configure or otherwiseperform rate matching for a situation where the available and/oractually transmitted SSBs 215 change. In some aspects, the bitmapindicated in the system information may be used (e.g., an 8-bit bitmap).However, the system information may also carry or convey an indicationof a maximum number of SSBs 215 available for use. In some aspects, themaximum number of SSBs 215 available for use may be greater than a totalnumber of SSBs 215 indicated by the bitmap (e.g., due to bitmap size).

For example, the system information (e.g., RMSI) may carry or convey thebitmap that indicates the subset of SSBs 215 transmitted from the set ofSSBs 215. As one example, the bitmap may be set to 10101010 to indicatethat SSBs 215 having indices of 0, 2, 4, and 6 are actually beingtransmitted and SSBs 215 having indices of 1, 3, 5, and 7 are not beingtransmitted. Thus, the set of SSBs 215 may include SSBs 215 havingindices 0-7, whereas the subset of SSBs 215 actually being transmittedonly includes SSBs 215 having indices of 0, 2, 4, and 6.

In some aspects, the maximum number of SSBs 215 available for use may begreater than the set of SSBs 215 indicated by the bitmap (e.g., due tothe size of the bitmap). For example, the system information (e.g.,RMSI) may indicate (e.g., in a parameter) the maximum number of SSB 215positions available for use. As one non-limiting example, the maximumnumber of SSBs 215 available for use may be 12, 16, 24, 32, or someother number of SSBs 215. In some aspects, the maximum number of SSBs215 available for use may refer to potential SSB 215 locations occurringwithin a particular time window, such as a DRS, within a particular setof slots or frames, and the like.

Based on receiving the system information, UE 210 may be able todetermine or otherwise ascertain that there are 16 (in one example)maximum number of SSBs 215 available for use and that the bitmapindicates the pattern of actually transmitted SSBs 215 within the set ofSSBs 215 indicated by the bitmap (e.g., on, off, on, off, etc., in theexample above for the first eight SSBs, where the size of the bitmap iseight). According to aspects of the described techniques, UE 210 mayrepeat the pattern in the bitmap for the SSBs 215 transmitted after theset of SSBs 215 indicated by the bitmap. For example and for the firsteight SSB 215 positions, UE 210 may determine that SSBs 215 havingindices of 0, 2, 4, and 6 are actually transmitted and SSBs 215 havingindices of 1, 3, 5, and 7 are not being transmitted. Repeating thepattern may include UE 210 determining that SSBs 215 having indices of8, 10, 12, 14, and so on are being transmitted and SSBs 215 havingindices of 9, 11, 13, 15, and so on are not being transmitted for thepurposes of rate matching for subsequent PDSCH. Accordingly, based onthe bitmap and the parameter indicated in the system information, UE 210may use a rule where the SSBs 215 occurring after the subset of SSBs 215(or rather after the set of SSBs 215) and within the maximum number ofSSBs 215 are repeated according to the pattern indicated in the bitmap.

Accordingly, UE 210 may receive the bitmap and the indication of themaximum number of SSBs 215 available for use (e.g., in a first RMSIPDSCH) and use this information to configure rate matching for receivingPDSCH transmissions. In some aspects, UE 210 may use the bitmap andindication of the maximum number of SSBs 215 available for use toconfigure or otherwise perform rate matching in subsequent PDSCHtransmissions from base station 205. For example, UE 210 may use theconfigured rate matching for the subsequent PDSCH transmissions by ratematching around SSBs 215 indicated as being transmitted in (or at thesame time as) the subsequent PDSCH transmissions. This may support UE210 rate matching around all potential SSB 215 transmissions asindicated by the bitmap with the repetition up to the maximum number ofSSBs 215 available for use. In some aspects, UE 210 may furtherconfigure rate matching resource sets to rate match into the SSBs nottransmitted (e.g., an SSBs 215 having indices of 1, 3, 5, and so on, upto the maximum number of SSBs 215 available for use). Accordingly, UE210 may receive the PDSCH transmission according to the rate matchingconfigured based on the bitmap and the indication of the maximum numberof SSBs 215 available for use.

In some aspects, the described techniques for rate matchingconfiguration may be associated with a particular discovery period(e.g., such as a DRS). For example, various aspects of SSB 215transmission may change periodically, as needed, according to aschedule, and the like. Accordingly, base station 205 may update theSSBs 215 depending upon the changes to the SSB 215 transmissionconfiguration and the associated time period or window. In one example,the configuration for transmission of SSBs 215 may change for each orsome or all DRS periods.

FIG. 3 illustrates an example of a SSB configuration 300 that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure. In some examples, SSB configuration 300 mayimplement aspects of wireless communication systems 100 and/or 200.Aspects of SSB configuration 300 may be implemented by a base stationand/or UE, which may be examples of the corresponding devices describedherein.

Broadly, SSB configuration 300 illustrates one example of how SSBs 305may be transmitted in accordance with aspects of the describedtechniques. In some aspects, the base station may be configured totransmit a plurality of SSBs 305 (with only one SSB 305 being labeledfor ease of reference) to one or more UEs operating within its coveragearea. For example, SSBs 305 having indices of 0-7 may be considered afirst plurality of SSBs that are configured for potential transmissionduring a specified time period or window, such as a DRS window 215.Accordingly, the base station may transmit the plurality of SSBs 305having indices 0-7 during a first DRS window 310-a, transmit theplurality of SSBs 305 having indices 0-7 during a second DRS window310-b, and transmit the plurality of SSBs 305 having indices 0-7 duringthird DRS window 310-c. In some aspects, the number and/or configurationfor SSBs 305 may change from one DRS window 310 to the next.

Broadly, SSBs 305 may be used by an initial access UE to ascertainsynchronization (at least to some degree) information for thetransmitting base station. For example, each SSB 305 may carry or conveyvarious frequency, timing, spatial, and the like information usable bythe UE to establish a connection with the base station. In some aspects,the plurality of SSBs may be transmitted within a given window or timeperiod, such as a DRS window 315.

In some aspects, the plurality of SSBs 305 may include a set of QCLSSBs. In some aspects, the number of SSBs 305 within a set of QCL SSBsmay be consistent for a given DRS window 310, but may be the same or maychange from one DRS window 310 to the next. In some aspects, theplurality of SSBs 305 may include multiple sets of QCL SSBs. As onenon-limiting example, SSBs 305 having indices of 0 and 4 may form afirst set of QCL SSBs (indicated by the forward slanting hashingpattern), SSBs 305 having indices 1 and 5 may form a second set of QCLSSBs (indicated by the cross-hashing pattern), SSBs 305 having indices 2and 6 may form a third set of QCL SSBs (indicated by the reverseslanting hashing pattern), and SSBs 305 having indices 3 and 7 may forma fourth set of QCL SSBs (indicated by the horizontal line hashingpattern).

Conventionally, an initial access UE may receive an SSB 305 and, basedon the index of the received SSB 305, the UE may know that index isassociated with a corresponding downlink control channel location (e.g.,time, frequency, spatial, or other location for the UE to use to monitorfor PDCCH signals). However, aspects of the described techniques supporta mechanism where additional candidate SSB 305 positions may beconfigured. That is, the plurality of SSBs 305 may include more than theillustrated eight SSBs 305 shown in FIG. 3, e.g., may include 12, 16, orsome other number of potential SSB 305 positions. In some aspects, thenumber of actually transmitted SSBs may be less than the number ofpossible SSB 305 positions. In this situation, each set of QCL SSBs mayinclude more than the two SSBs 305 discussed in the example above. Forexample, the first set of QCL SSBs may include SSBs 305 with indices of0, 4, 8 (not shown), 12 (also not shown), and so on.

Moreover, some wireless networks may operate in a mmW network where thebase station must perform an LBT procedure before transmitting each (orsome or all) SSB(s) 305. As can be appreciated, not every LBT proceduremay be successful, and therefore the base station may be unable totransmit SSBs 305 until the LBT procedure succeeds. As a first exampleand during the DRS window 310-a, the LBT procedure may successful suchthat the base station is able to begin transmitting SSB 305 startingwith SSB index 0. However, in a second example and during the DRS window310-b, the LBT procedure may not pass initially, but instead pass orsucceed in time for the base station to begin transmitting SSBs 305beginning with SSB index 2. In a third example and during the DRS window310-c, the LBT procedure may not pass until the time when the SSB 305having an index of 4 is scheduled for transmission. Accordingly, thenumber of SSBs 305 transmitted may vary depending on whether or not theLBT procedure is successful. In some examples, the base station maychoose to transmit only four SSBs of the configured eight to minimizethe number of SSBs actually transmitted while ensuring that SSBs fromeach of the four sets of QCL SSBs are transmitted at least once.

All of these issues may create problems for an initial access UE wishingto establish a connection with the base station. For example, the UE maydetect or otherwise receive an SSB 305 having an index of 1.Conventionally, the UE would use the index of the received SSB 305 toidentify the location for monitoring a downlink control channel (e.g.,PDCCH) as conventional techniques utilized a one-to-one mapping betweenthe SSB 305 index and the corresponding downlink control channellocation. However, this approach may be problematic when multiple SSBindexes overlap with the same (or substantially the same) downlinkcontrol channel location, e.g., such as when a set of QCL SSBs are usedor when some of the SSB locations are not transmitted due to LBTfailures. For example, on detecting the SSB at location 1, inconventional systems the UE may look for PDCCH corresponding to the sameQCL in the vicinity of SSB location 1 in subsequent DRS occasions.However, in subsequent DRC occasions SSB and system information may notbe sent in location 1 due to LBT failure, but may be sent in location 5.Since location 5 and location 1 have the same QCL, if the UE had lookedfor the PDSCH/system information in the vicinity of location 5, it wouldhave been able to receive the system information.

Accordingly, aspects of the described techniques provide a mechanismwhere each SSB 305 has a corresponding index, but a set of QCL SSBs maybe associated with the same (or substantially similar) downlink controlchannel location. In some aspects, this may include the base stationconfiguring the SSB to include or otherwise convey an indication of aparameter indicating information associated with downlink controlchannel locations corresponding to the set of QCL SSBs. For example, theparameter (e.g., parameter “X”) may be an integer number or subset ofinteger numbers, depending on the number of bits used to convey theindication of the parameter in each SSB 305. Generally, each SSB 305within the set of QCL SSBs may have the same or substantially similarQCL configurations. In some examples, the parameter may not necessarilybe tied to the number of beams being used for transmitting SSBs 305.

The UE may receive the SSB 305 (e.g., SSB index 1, or x=1) and determinethe parameter indicated in the SSB 305. The UE may use this informationto determine the downlink control channel location(s) that correspond tothe set of QCL SSBs. Generally, the downlink control channel location(s)may refer to time, frequency, spatial, or some other resource used bythe base station for transmitting the downlink control channel. The UEmay receive (e.g., by monitoring) the determined downlink controlchannel locations that correspond to the set of QCL SSBs to receive adownlink grant for a system information (e.g., RMSI PDSCH) on at leastone of the downlink control channel locations. The UE may receive thesystem information according to the grant and establish a connection tothe base station based on the received SSB 305, the system information,and the like.

As discussed, in some aspects the parameter may carry or convey anindication of an offset between successive SSBs 305 within the set ofQCL SSBs. In the example discussed above, SSBs 305 having indices 0 and4 may be considered a first set of QCL SSBs where, in this example, theparameter may indicate a value of “4” to inform the UE that every fourthSSB 305 may have or otherwise use the same or similar QCL configurationand/or may be associated with the same or similar PDCCH location.Accordingly, the UE receiving SSB 305 with index 1 may know that SSB 305with index 5 may use the same or substantially similar QCLconfiguration.

In some aspects, some or all of the SSB 305 may be carried or conveyedin a PBCH. As the same parameter may be duplicated in each SSB 305, theUE may perform soft combining across a plurality of SSBs 305 todetermine the indicated parameter.

FIGS. 4A and 4B illustrate examples of SSB configuration 400 thatsupports control search space overlap indication in accordance withaspects of the present disclosure. In some examples, SSB configuration400 may implement aspects of wireless communication systems 100 and/or200, and/or SSB configuration 300. Aspects of SSB configuration 400 maybe implemented by a base station and/or UE, which may be examples ofcorresponding devices described herein.

As discussed, conventional techniques typically include an RMSI PDSCHcarrying or conveying an indication of an 8-bit bitmap indicating whichset of a maximum number of 8 SSBs that are actually being transmitted.PDSCH transmissions will rate match around the resource blocks/symbolsused by the indicated SSBs. However, this design is based on the factthat the set of SSBs actually transmitted across all frames are thesame. Accordingly, conventional techniques do not support the scenariowhere the actual number of SSBs being transmitted and/or being availablemay vary from one frame to the next, from one DRS period to the next,and so on. Additionally, the conventional techniques sized the bitmapcorresponding to a maximum size of available SSB transmissionopportunities for a licensed carrier where SSBs can always betransmitted. In unlicensed carrier, where the transmissions have toundergo an LBT procedure before transmission, we may wish to configure amuch larger number of the available SSB transmission opportunities asmany SSB transmission opportunities may not be usable at any particularinstance due to LBT failure. Hence we could increase the bitmap size forthe largest size anticipated to be used on an unlicensed system whichwould entail high overhead. Hence alternate solutions are desirable.Accordingly, aspects of the described techniques support improved ratematching behavior in such a scenario.

For example, a base station may transmit a maximum number of SSBs 405available for use. Generally, the maximum number of SSBs 405 availablefor use may refer to possible positions where the SSB transmissions mayoccur. In the example illustrated in FIG. 4A, the maximum number of SSBs405 available for use may include 16 SSB positions, whereas the maximumnumber of SSBs 405 available for use illustrated in FIG. 4B may include12 SSB positions. Other configurations for the maximum number of SSBs405 available for use may also be used.

In some aspects, the bitmap used in the conventional networks may beapplied, at least in some aspects, in accordance with the describedtechniques. For example, a base station may transmit (and UE mayreceive) a system information (e.g., RMSI PDSCH) that carries or conveysan indication of the bitmap indicating the subset of SSBs transmittedfrom the set of SSBs. With reference to SSB configurations 400-a and400-b, the bitmap may be set to “10101010” to indicate that the set ofSSBs includes SSBs having indices 0-7. In this context, the set of SSBsmay refer to each of the SSBs having indices 0-7, where the subset ofSSBs actually being transmitted from the set of SSBs may include SSBshaving indices 0, 2, 4, and 6 (as illustrated by the hash pattern). Theinformation or pattern indicated in the bitmap may refer to theper/bitmap SSBs 410.

However, the maximum number of SSBs 405 available for use in thisscenario may be greater than the set of SSBs (e.g., the maximum numberof SSBs 405 available for use may be 16 as illustrated in FIG. 4A or 12as illustrated in FIG. 4B). Accordingly, the base station may alsoconfigure the system information to carry or convey an indication of themaximum number of SSBs 405 available for use (e.g., the maximum SSBpositions being used). For example, the system information may include abit or field configured to convey the indication of the maximum numberof SSBs available for use (e.g., a fixed count of used SSBs, an endlocation for the last used SSB, and the like).

In some aspects, the UE may receive the system information and recoverthe bitmap and the indication of the maximum number of SSBs availablefor use. The UE may use this information to configure rate matching forPDSCH transmissions. In some aspects, this may include the UE repeatingthe pattern indicated in the bitmap for SSBs that occur after the SSBsin the set of SSBs (e.g., that occur after the subset of SSBs actuallytransmitted). In the example discussed above, the pattern may generallyrefer to a first SSB being transmitted (SSB index 0), a second SSB notbeing transmitted (SSB index 1), the third SSB being transmitted (SSBindex 2), a fourth SSB not being transmitted (SSB index 3), and so on.The UE may use this pattern for the remaining SSBs within the maximumnumber of SSBs 405 available for use. For example, the UE may know thatSSB index 8 will be transmitted, that SSB index 9 will not betransmitted, that SSB index 10 will be transmitted, and so on (this isillustrated as the bitmap indicated SSBs repeated 415). Accordingly, theUE may use this information based on the bitmap and the maximum numberof SSBs 405 available for use for PDSCH rate matching. References to anSSB corresponding to an SSB index that will be transmitted, may alsorefer to a UE assumption of SSB transmission in regards to PDSCH ratematching, the base station may not actually be transmitting thatparticular SSB. In some aspects, the UE may receive the bitmap and theindication of the maximum number of SSBs 405 available for use in afirst PDSCH (e.g., an RMSI PDSCH), and use the configured rate matchingin subsequent PDSCH transmissions (e.g., and non-RMSI PDSCHtransmissions). For example, the UE may rate match around the SSBs beingtransmitted during the subsequent PDSCH transmissions.

In the example illustrated in FIG. 4B, the UE may use the bitmap (or thepattern indicated in the bitmap) and the indication of the maximumnumber of used SSB to determine that the SSB index 8 is beingtransmitted, that SSB index 9 is not being transmitted, that SSB index10 is being transmitted, and that SSB index 11 is not being transmitted(again, this is illustrated as the bitmap indicated SSBs repeated 415).Accordingly, for the subsequent PDSCH transmissions, the UE may use thisinformation to rate match around SSBs actually being transmitted.

FIG. 5 illustrates an example of a process 500 that supports controlsearch space overlap indication in accordance with aspects of thepresent disclosure. In some examples, process 500 may implement aspectsof wireless communication systems 100, 200, and/or SSB configurations300, 400. Aspects of process 500 may be performed by a base station 505and/or UE 510, which may be examples of corresponding devices describedherein.

At 515, base station 505 may transmit (and UE 510 may receive) an SSB ofa set of QCL SSBs. In some aspects, the SSB may carry or convey anindication of a parameter indicating information associated with aplurality of downlink control channel locations that correspond to theset of QCL SSBs. In some aspects, the parameter may carry or convey anindication of an offset between successive SSBs within the set of QCLSSBs. In some aspects, this may include base station 505 transmitting(and UE 510 receiving) a PBCH portion of the SSB, e.g., the PBCH portionmay carry or convey the indication of the parameter. In some aspects, UE510 may receive multiple instances of the SSB (or PBCH portions of theSSB) and use soft combining across the multiple SSBs to recover theparameter.

In some aspects, base station 505 may transmit a plurality of SSBs toone or more UEs located within its coverage area. In some aspects, eachSSB may additionally convey or indicate various synchronizationinformation usable by such UEs to synchronize, at least to some degree,with base station 505.

At 520, UE 510 may determine, based at least in part on the parameter,the plurality of downlink control channel locations corresponding to theset of QCL SSBs. In some aspects, this may include UE 510 determining anindex of each SSB of the set of QCL SSBs. UE 510 may use the index todetermine the plurality of downlink control channel locations. In someaspects, this may be based on the frame in which the SSB is received andthe parameter indicated in the SSB. In some aspects, the plurality ofdownlink control channel locations may refer to a type-0 PDCCH commonsearch space.

At 525, base station 505 may transmit (and UE 510 may receive) adownlink grant for a system information based at least in part on UE 510monitoring one or more of the downlink control channel locations. Insome aspects, this may include UE 510 monitoring each downlink controlchannel location of the plurality of downlink control channel locationsin order to receive the downlink grant. For example, UE 510 maydetermine that no downlink control information was detected during afirst instance of the plurality of downlink control channel locations(e.g., in a first downlink control channel location). Accordingly, UE510 may monitor the second instance of the plurality of downlink controlchannel locations (e.g., in a second, third, fourth, etc., downlinkcontrol channel location as needed) to detect the downlink grant.

At 530, base station 505 may transmit (and UE 510 may receive) thesystem information according to the downlink grant. In some aspects, thesystem information may refer to an RMSI indicated in a PDSCHtransmission from base station 505. At 535, base station 505 and UE 510may establish a connection based at least in part on the SSB received at515 and the system information.

FIG. 6 illustrates an example of a process 600 that supports controlsearch space overlap indication in accordance with aspects of thepresent disclosure. In some examples, process 600 may implement aspectsof wireless communication systems 100, 200, and/or SSB configurations300, 400. Aspects of process 600 may be implemented by a base station605 and/or UE 610, which may be examples of corresponding devicesdescribed herein.

At 615, base station 605 may transmit (and UE 610 may receive) a systeminformation that carries or conveys an indication of a bitmap indicatinga subset of SSBs transmitted from a set of SSBs. In some aspects, thesystem information may also carry or convey an indication of a maximumnumber of SSBs available for use. In some aspects, the maximum number ofSSBs available for use may be greater than a total number of SSBs in theset of SSBs. In some aspects, the system information is conveyed in aprevious PDSCH transmission. In some aspects, the system information mayrefer to a RMSI indicated in the previous PDSCH transmission.

At 620, UE 610 may configure rate matching based at least in part on thesubset of SSBs indicated by the bitmap and the indicated maximum numberof SSBs available for use. In some aspects, this may include UE 610repeating a pattern in the bitmap for the subset of SSBs within the setof SSBs as well as for SSBs occurring after the subset of SSBs andwithin the maximum number of SSBs available for use.

At 625, base station 605 may transmit (and UE 610 may receive) the PDSCHtransmission based at least in part on the rate matching. As discussed,this may include the system information being transmitted in a previousPDSCH transmission whereas UE 610 performs the PDSCH transmission withbase station 605 by rate matching around SSBs transmitted in subsequentPDSCH transmissions. In some aspects, the PDSCH transmission may bereceived during a same discovery period (e.g., DRS period) in which themaximum number of SSBs available for use may be transmitted.

FIG. 7 shows a block diagram 700 of a device 705 that supports controlsearch space overlap indication in accordance with aspects of thepresent disclosure. The device 705 may be an example of aspects of a UE115 as described herein. The device 705 may include a receiver 710, acommunications manager 715, and a transmitter 720. The device 705 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 710 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to controlsearch space overlap indication, etc.). Information may be passed on toother components of the device 705. The receiver 710 may be an exampleof aspects of the transceiver 1020 described with reference to FIG. 10.The receiver 710 may utilize a single antenna or a set of antennas.

The communications manager 715 may receive, from a base station, a SSBof a set of QCL SSBs, the SSB including an indication of a parameterindicating information associated with a set of downlink control channellocations corresponding to the set of QCL SSBs, determine, based on theparameter, the set of downlink control channel locations correspondingto the set of QCL SSBs, receive a downlink grant for a systeminformation based on monitoring one or more downlink control channellocations of the set of downlink control channel locations, receive thesystem information based on the downlink grant, and establish aconnection with the base station based on the SSB and the receivedsystem information. The communications manager 715 may also receive asystem information including a bitmap indicating a subset of SSBstransmitted from a set of SSBs, the system information signal furtherindicating a maximum number of SSBs available for use, where the maximumnumber of SSBs available for use is greater than a total number of SSBsin the set of SSBs, configure rate matching based on the subset of SSBsindicated by the bitmap and the indicated maximum number of SSBsavailable for use, and receive a physical downlink shared channeltransmission based on the rate matching. The communications manager 715may be an example of aspects of the communications manager 1010described herein.

The communications manager 715, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 715, or itssub-components may be executed by a general-purpose processor, a DSP, anapplication-specific integrated circuit (ASIC), a FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described in the present disclosure.

The communications manager 715, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationsmanager 715, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communications manager 715, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 720 may transmit signals generated by other componentsof the device 705. In some examples, the transmitter 720 may becollocated with a receiver 710 in a transceiver module. For example, thetransmitter 720 may be an example of aspects of the transceiver 1020described with reference to FIG. 10. The transmitter 720 may utilize asingle antenna or a set of antennas.

FIG. 8 shows a block diagram 800 of a device 805 that supports controlsearch space overlap indication in accordance with aspects of thepresent disclosure. The device 805 may be an example of aspects of adevice 705, or a UE 115 as described herein. The device 805 may includea receiver 810, a communications manager 815, and a transmitter 850. Thedevice 805 may also include a processor. Each of these components may bein communication with one another (e.g., via one or more buses).

The receiver 810 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to controlsearch space overlap indication, etc.). Information may be passed on toother components of the device 805. The receiver 810 may be an exampleof aspects of the transceiver 1020 described with reference to FIG. 10.The receiver 810 may utilize a single antenna or a set of antennas.

The communications manager 815 may be an example of aspects of thecommunications manager 715 as described herein. The communicationsmanager 815 may include a QCL SSB manager 820, a PDCCH location manager825, a RMSI manager 830, a connection manager 835, a SSB parametermanager 840, and a rate matching manager 845. The communications manager815 may be an example of aspects of the communications manager 1010described herein.

The QCL SSB manager 820 may receive, from a base station, a SSB of a setof QCL SSBs, the SSB including an indication of a parameter indicatinginformation associated with a set of downlink control channel locationscorresponding to the set of QCL SSBs.

The PDCCH location manager 825 may determine, based on the parameter,the set of downlink control channel locations corresponding to the setof QCL SSBs and receive a downlink grant for a system information basedon monitoring one or more downlink control channel locations of the setof downlink control channel locations.

The RMSI manager 830 may receive the system information based on thedownlink grant.

The connection manager 835 may establish a connection with the basestation based on the SSB and the received system information.

The SSB parameter manager 840 may receive a system information includinga bitmap indicating a subset of SSBs transmitted from a set of SSBs, thesystem information signal further indicating a maximum number of SSBsavailable for use, where the maximum number of SSBs available for use isgreater than a total number of SSBs in the set of SSBs.

The rate matching manager 845 may configure rate matching based on thesubset of SSBs indicated by the bitmap and the indicated maximum numberof SSBs available for use and receive a physical downlink shared channeltransmission based on the rate matching.

The transmitter 850 may transmit signals generated by other componentsof the device 805. In some examples, the transmitter 850 may becollocated with a receiver 810 in a transceiver module. For example, thetransmitter 850 may be an example of aspects of the transceiver 1020described with reference to FIG. 10. The transmitter 850 may utilize asingle antenna or a set of antennas.

FIG. 9 shows a block diagram 900 of a communications manager 905 thatsupports control search space overlap indication in accordance withaspects of the present disclosure. The communications manager 905 may bean example of aspects of a communications manager 715, a communicationsmanager 815, or a communications manager 1010 described herein. Thecommunications manager 905 may include a QCL SSB manager 910, a PDCCHlocation manager 915, a RMSI manager 920, a connection manager 925, aPBCH manager 930, a SSB index manager 935, a SSB parameter manager 940,a rate matching manager 945, a SSB pattern manager 950, and a PDSCHlocation manager 955. Each of these modules may communicate, directly orindirectly, with one another (e.g., via one or more buses).

The QCL SSB manager 910 may receive, from a base station, a SSB of a setof QCL SSBs, the SSB including an indication of a parameter indicatinginformation associated with a set of downlink control channel locationscorresponding to the set of QCL SSBs. In some cases, the parameterincludes an indication of offset between successive SSBs within the setof QCL SSBs.

The PDCCH location manager 915 may determine, based on the parameter,the set of downlink control channel locations corresponding to the setof QCL SSBs. In some examples, the PDCCH location manager 915 mayreceive a downlink grant for a system information based on monitoringone or more downlink control channel locations of the set of downlinkcontrol channel locations. In some examples, the PDCCH location manager915 may determine the set of downlink control channel locations is basedon a frame in which the SSB is received and the parameter indicated inthe SSB.

In some examples, the PDCCH location manager 915 may monitor eachdownlink control channel location of the set of downlink control channellocations. In some examples, the PDCCH location manager 915 maydetermine that no downlink control information was detected during afirst instance of the set of downlink control channel locations. In someexamples, the PDCCH location manager 915 may monitor, based on theparameter, a second instance of the set of downlink control channellocations to detect the downlink grant. In some cases, the downlinkcontrol channel locations of the set of downlink control channellocations include type 0 physical downlink control channel common searchspaces.

The RMSI manager 920 may receive the system information based on thedownlink grant.

The connection manager 925 may establish a connection with the basestation based on the SSB and the received system information.

The SSB parameter manager 940 may receive a system information includinga bitmap indicating a subset of SSBs transmitted from a set of SSBs, thesystem information signal further indicating a maximum number of SSBsavailable for use, where the maximum number of SSBs available for use isgreater than a total number of SSBs in the set of SSBs.

The rate matching manager 945 may configure rate matching based on thesubset of SSBs indicated by the bitmap and the indicated maximum numberof SSBs available for use.

In some examples, the rate matching manager 945 may receive a physicaldownlink shared channel transmission based on the rate matching.

The PBCH manager 930 may receive a physical broadcast channel portion ofthe SSB, the physical broadcast channel portion of the SSB including theindication of the parameter. In some examples, the PBCH manager 930 mayperform soft combining across a set of SSBs. In some cases, theindication of the parameter is common across each SSB of the set ofSSBs.

The SSB index manager 935 may determine indices of each SSB of the setof QCL SSBs. In some examples, the SSB index manager 935 may wheredetermining the set of downlink control channel locations is based onthe determined index of each SSB of the set of QCL SSBs.

The SSB pattern manager 950 may repeat a pattern in the bitmap for thesubset of SSBs within the set of SSBs and for SSBs occurring after thesubset of SSBs and within the maximum number of SSBs available for use.

The PDSCH location manager 955 may receive a previous physical downlinkshared channel transmission including the system information.

In some examples, the PDSCH location manager 955 may decode the systeminformation to identify the bitmap, where rate matching is not performedon the previous physical downlink shared channel. In some cases, thephysical downlink shared channel transmission is received during a samediscovery period in which the maximum number of SSBs available for usemay be transmitted.

FIG. 10 shows a diagram of a system 1000 including a device 1005 thatsupports control search space overlap indication in accordance withaspects of the present disclosure. The device 1005 may be an example ofor include the components of device 705, device 805, or a UE 115 asdescribed herein. The device 1005 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including a communicationsmanager 1010, an I/O controller 1015, a transceiver 1020, an antenna1025, memory 1030, and a processor 1040. These components may be inelectronic communication via one or more buses (e.g., bus 1045).

The communications manager 1010 may receive, from a base station, a SSBof a set of QCL SSBs, the SSB including an indication of a parameterindicating information associated with a set of downlink control channellocations corresponding to the set of QCL SSBs, determine, based on theparameter, the set of downlink control channel locations correspondingto the set of QCL SSBs, receive a downlink grant for a systeminformation based on monitoring one or more downlink control channellocations of the set of downlink control channel locations, receive thesystem information based on the downlink grant, and establish aconnection with the base station based on the SSB and the receivedsystem information. The communications manager 1010 may also receive asystem information including a bitmap indicating a subset of SSBstransmitted from a set of SSBs, the system information signal furtherindicating a maximum number of SSBs available for use, where the maximumnumber of SSBs available for use is greater than a total number of SSBsin the set of SSBs, configure rate matching based on the subset of SSBsindicated by the bitmap and the indicated maximum number of SSBsavailable for use, and receive a physical downlink shared channeltransmission based on the rate matching.

The I/O controller 1015 may manage input and output signals for thedevice 1005. The I/O controller 1015 may also manage peripherals notintegrated into the device 1005. In some cases, the I/O controller 1015may represent a physical connection or port to an external peripheral.In some cases, the I/O controller 1015 may utilize an operating systemsuch as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, oranother known operating system. In other cases, the I/O controller 1015may represent or interact with a modem, a keyboard, a mouse, atouchscreen, or a similar device. In some cases, the I/O controller 1015may be implemented as part of a processor. In some cases, a user mayinteract with the device 1005 via the I/O controller 1015 or viahardware components controlled by the I/O controller 1015.

The transceiver 1020 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1020 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1020 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1025.However, in some cases the device may have more than one antenna 1025,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 1030 may include RAM and ROM. The memory 1030 may storecomputer-readable, computer-executable code 1035 including instructionsthat, when executed, cause the processor to perform various functionsdescribed herein. In some cases, the memory 1030 may contain, amongother things, a BIOS which may control basic hardware or softwareoperation such as the interaction with peripheral components or devices.

The processor 1040 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 1040 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into the processor 1040. The processor 1040 may beconfigured to execute computer-readable instructions stored in a memory(e.g., the memory 1030) to cause the device 1005 to perform variousfunctions (e.g., functions or tasks supporting control search spaceoverlap indication).

The code 1035 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 1035 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 1035 may not be directly executable by theprocessor 1040 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 11 shows a block diagram 1100 of a device 1105 that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure. The device 1105 may be an example of aspects ofa base station 105 as described herein. The device 1105 may include areceiver 1110, a communications manager 1115, and a transmitter 1120.The device 1105 may also include a processor. Each of these componentsmay be in communication with one another (e.g., via one or more buses).

The receiver 1110 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to controlsearch space overlap indication, etc.). Information may be passed on toother components of the device 1105. The receiver 1110 may be an exampleof aspects of the transceiver 1420 described with reference to FIG. 14.The receiver 1110 may utilize a single antenna or a set of antennas.

The communications manager 1115 may transmit a set of SSBs, the set ofSSBs including a set of QCL SSBs, where each SSB of the set of SSBsincludes an indication of a parameter indicating information associatedwith a set of downlink control channel locations corresponding to theset of QCL SSBs, transmit, based on the parameter, a downlink grant fora system information over the set of downlink control channel locationscorresponding to the set of QCL SSBs, transmit the system informationaccording to the grant, and establish a connection with a UE based onthe SSB and the system information. The communications manager 1115 mayalso transmit a system information including a bitmap indicating asubset of SSBs transmitted from a set of SSBs, the system informationfurther indicating a maximum number of SSBs available for use, where themaximum number of SSBs available for use is greater than a total numberof SSBs in the set of SSBs, configure rate matching based on the subsetof SSBs indicated by the bitmap and the indicated maximum number of SSBsavailable for use, and perform a physical downlink shared channeltransmission based on the rate matching. The communications manager 1115may be an example of aspects of the communications manager 1410described herein.

The communications manager 1115, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 1115, or itssub-components may be executed by a general-purpose processor, a DSP, anapplication-specific integrated circuit (ASIC), a FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described in the present disclosure.

The communications manager 1115, or its sub-components, may bephysically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations by one or more physical components. In some examples, thecommunications manager 1115, or its sub-components, may be a separateand distinct component in accordance with various aspects of the presentdisclosure. In some examples, the communications manager 1115, or itssub-components, may be combined with one or more other hardwarecomponents, including but not limited to an input/output (I/O)component, a transceiver, a network server, another computing device,one or more other components described in the present disclosure, or acombination thereof in accordance with various aspects of the presentdisclosure.

The transmitter 1120 may transmit signals generated by other componentsof the device 1105. In some examples, the transmitter 1120 may becollocated with a receiver 1110 in a transceiver module. For example,the transmitter 1120 may be an example of aspects of the transceiver1420 described with reference to FIG. 14. The transmitter 1120 mayutilize a single antenna or a set of antennas.

FIG. 12 shows a block diagram 1200 of a device 1205 that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure. The device 1205 may be an example of aspects ofa device 1105, or a base station 105 as described herein. The device1205 may include a receiver 1210, a communications manager 1215, and atransmitter 1250. The device 1205 may also include a processor. Each ofthese components may be in communication with one another (e.g., via oneor more buses).

The receiver 1210 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to controlsearch space overlap indication, etc.). Information may be passed on toother components of the device 1205. The receiver 1210 may be an exampleof aspects of the transceiver 1420 described with reference to FIG. 14.The receiver 1210 may utilize a single antenna or a set of antennas.

The communications manager 1215 may be an example of aspects of thecommunications manager 1115 as described herein. The communicationsmanager 1215 may include a QCL SSB manager 1220, a PDCCH locationmanager 1225, a RMSI manager 1230, a connection manager 1235, a SSBparameter manager 1240, and a rate matching manager 1245. Thecommunications manager 1215 may be an example of aspects of thecommunications manager 1410 described herein.

The QCL SSB manager 1220 may transmit a set of SSBs, the set of SSBsincluding a set of QCL SSBs, where each SSB of the set of SSBs includesan indication of a parameter indicating information associated with aset of downlink control channel locations corresponding to the set ofQCL SSBs.

The PDCCH location manager 1225 may transmit, based on the parameter, adownlink grant for a system information over the set of downlink controlchannel locations corresponding to the set of QCL SSBs.

The RMSI manager 1230 may transmit the system information according tothe grant.

The connection manager 1235 may establish a connection with a UE basedon the SSB and the system information.

The SSB parameter manager 1240 may transmit a system informationincluding a bitmap indicating a subset of SSBs transmitted from a set ofSSBs, the system information further indicating a maximum number of SSBsavailable for use, where the maximum number of SSBs available for use isgreater than a total number of SSBs in the set of SSBs.

The rate matching manager 1245 may configure rate matching based on thesubset of SSBs indicated by the bitmap and the indicated maximum numberof SSBs available for use and perform a physical downlink shared channeltransmission based on the rate matching.

The transmitter 1250 may transmit signals generated by other componentsof the device 1205. In some examples, the transmitter 1250 may becollocated with a receiver 1210 in a transceiver module. For example,the transmitter 1250 may be an example of aspects of the transceiver1420 described with reference to FIG. 14. The transmitter 1250 mayutilize a single antenna or a set of antennas.

FIG. 13 shows a block diagram 1300 of a communications manager 1305 thatsupports control search space overlap indication in accordance withaspects of the present disclosure. The communications manager 1305 maybe an example of aspects of a communications manager 1115, acommunications manager 1215, or a communications manager 1410 describedherein. The communications manager 1305 may include a QCL SSB manager1310, a PDCCH location manager 1315, a RMSI manager 1320, a connectionmanager 1325, a PBCH manager 1330, a SSB parameter manager 1335, a ratematching manager 1340, a SSB pattern manager 1345, and a PDSCH locationmanager 1350. Each of these modules may communicate, directly orindirectly, with one another (e.g., via one or more buses).

The QCL SSB manager 1310 may transmit a set of SSBs, the set of SSBsincluding a set of QCL SSBs, where each SSB of the set of SSBs includesan indication of a parameter indicating information associated with aset of downlink control channel locations corresponding to the set ofQCL SSBs. In some cases, the parameter includes an indication of anoffset between successive SSBs within the set of QCL SSBs.

The PDCCH location manager 1315 may transmit, based on the parameter, adownlink grant for a system information over the set of downlink controlchannel locations corresponding to the set of QCL SSBs.

The RMSI manager 1320 may transmit the system information according tothe grant.

The connection manager 1325 may establish a connection with a UE basedon the SSB and the system information.

The SSB parameter manager 1335 may transmit a system informationincluding a bitmap indicating a subset of SSBs transmitted from a set ofSSBs, the system information further indicating a maximum number of SSBsavailable for use, where the maximum number of SSBs available for use isgreater than a total number of SSBs in the set of SSBs.

The rate matching manager 1340 may configure rate matching based on thesubset of SSBs indicated by the bitmap and the indicated maximum numberof SSBs available for use. In some examples, the rate matching manager1340 may perform a physical downlink shared channel transmission basedon the rate matching.

The PBCH manager 1330 may transmit a physical broadcast channel portionof the SSB, the physical broadcast portion of the SSB including theindication of the parameter. In some cases, the indication of theparameter is common across each SSB of the set of SSBs.

The SSB pattern manager 1345 may repeat a pattern in the bitmap fortransmitting the subset of SSBs within the set of SSBs and for a set ofadditional SSBs transmitted after the subset of SSBs and within themaximum number of SSBs available for use.

The PDSCH location manager 1350 may perform a previous physical downlinkshared channel transmission including the system information.

FIG. 14 shows a diagram of a system 1400 including a device 1405 thatsupports control search space overlap indication in accordance withaspects of the present disclosure. The device 1405 may be an example ofor include the components of device 1105, device 1205, or a base station105 as described herein. The device 1405 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including a communicationsmanager 1410, a network communications manager 1415, a transceiver 1420,an antenna 1425, memory 1430, a processor 1440, and an inter-stationcommunications manager 1445. These components may be in electroniccommunication via one or more buses (e.g., bus 1450).

The communications manager 1410 may transmit a set of SSBs, the set ofSSBs including a set of QCL SSBs, where each SSB of the set of SSBsincludes an indication of a parameter indicating information associatedwith a set of downlink control channel locations corresponding to theset of QCL SSBs, transmit, based on the parameter, a downlink grant fora system information over the set of downlink control channel locationscorresponding to the set of QCL SSBs, transmit the system informationaccording to the grant, and establish a connection with a UE based onthe SSB and the system information. The communications manager 1410 mayalso transmit a system information including a bitmap indicating asubset of SSBs transmitted from a set of SSBs, the system informationfurther indicating a maximum number of SSBs available for use, where themaximum number of SSBs available for use is greater than a total numberof SSBs in the set of SSBs, configure rate matching based on the subsetof SSBs indicated by the bitmap and the indicated maximum number of SSBsavailable for use, and perform a physical downlink shared channeltransmission based on the rate matching.

The network communications manager 1415 may manage communications withthe core network (e.g., via one or more wired backhaul links). Forexample, the network communications manager 1415 may manage the transferof data communications for client devices, such as one or more UEs 115.

The transceiver 1420 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1420 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1420 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1425.However, in some cases the device may have more than one antenna 1425,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 1430 may include RAM, ROM, or a combination thereof. Thememory 1430 may store computer-readable code 1435 including instructionsthat, when executed by a processor (e.g., the processor 1440) cause thedevice to perform various functions described herein. In some cases, thememory 1430 may contain, among other things, a BIOS which may controlbasic hardware or software operation such as the interaction withperipheral components or devices.

The processor 1440 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 1440 may be configured to operate a memoryarray using a memory controller. In some cases, a memory controller maybe integrated into processor 1440. The processor 1440 may be configuredto execute computer-readable instructions stored in a memory (e.g., thememory 1430) to cause the device 1405 to perform various functions(e.g., functions or tasks supporting control search space overlapindication).

The inter-station communications manager 1445 may manage communicationswith other base station 105, and may include a controller or schedulerfor controlling communications with UEs 115 in cooperation with otherbase stations 105. For example, the inter-station communications manager1445 may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, the inter-station communications manager1445 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

The code 1435 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 1435 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 1435 may not be directly executable by theprocessor 1440 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 15 shows a flowchart illustrating a method 1500 that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure. The operations of method 1500 may be implementedby a UE 115 or its components as described herein. For example, theoperations of method 1500 may be performed by a communications manageras described with reference to FIGS. 7 through 10. In some examples, aUE may execute a set of instructions to control the functional elementsof the UE to perform the functions described below. Additionally oralternatively, a UE may perform aspects of the functions described belowusing special-purpose hardware.

At 1505, the UE may receive, from a base station, a SSB of a set of QCLSSBs, the SSB including an indication of a parameter indicatinginformation associated with a set of downlink control channel locationscorresponding to the set of QCL SSBs. The operations of 1505 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1505 may be performed by a QCL SSB manageras described with reference to FIGS. 7 through 10.

At 1510, the UE may determine, based on the parameter, the set ofdownlink control channel locations corresponding to the set of QCL SSBs.The operations of 1510 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1510may be performed by a PDCCH location manager as described with referenceto FIGS. 7 through 10.

At 1515, the UE may receive a downlink grant for a system informationbased on monitoring one or more downlink control channel locations ofthe set of downlink control channel locations. The operations of 1515may be performed according to the methods described herein. In someexamples, aspects of the operations of 1515 may be performed by a PDCCHlocation manager as described with reference to FIGS. 7 through 10.

At 1520, the UE may receive the system information based on the downlinkgrant. The operations of 1520 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1520may be performed by a RMSI manager as described with reference to FIGS.7 through 10.

At 1525, the UE may establish a connection with the base station basedon the SSB and the received system information. The operations of 1525may be performed according to the methods described herein. In someexamples, aspects of the operations of 1525 may be performed by aconnection manager as described with reference to FIGS. 7 through 10.

FIG. 16 shows a flowchart illustrating a method 1600 that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure. The operations of method 1600 may be implementedby a base station 105 or its components as described herein. Forexample, the operations of method 1600 may be performed by acommunications manager as described with reference to FIGS. 11 through14. In some examples, a base station may execute a set of instructionsto control the functional elements of the base station to perform thefunctions described below. Additionally or alternatively, a base stationmay perform aspects of the functions described below usingspecial-purpose hardware.

At 1605, the base station may transmit a set of SSBs, the set of SSBsincluding a set of QCL SSBs, where each SSB of the set of SSBs includesan indication of a parameter indicating information associated with aset of downlink control channel locations corresponding to the set ofQCL SSBs. The operations of 1605 may be performed according to themethods described herein. In some examples, aspects of the operations of1605 may be performed by a QCL SSB manager as described with referenceto FIGS. 11 through 14.

At 1610, the base station may transmit, based on the parameter, adownlink grant for a system information over the set of downlink controlchannel locations corresponding to the set of QCL SSBs. The operationsof 1610 may be performed according to the methods described herein. Insome examples, aspects of the operations of 1610 may be performed by aPDCCH location manager as described with reference to FIGS. 11 through14.

At 1615, the base station may transmit the system information accordingto the grant. The operations of 1615 may be performed according to themethods described herein. In some examples, aspects of the operations of1615 may be performed by a RMSI manager as described with reference toFIGS. 11 through 14.

At 1620, the base station may establish a connection with a UE based onthe SSB and the system information. The operations of 1620 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1620 may be performed by a connectionmanager as described with reference to FIGS. 11 through 14.

FIG. 17 shows a flowchart illustrating a method 1700 that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure. The operations of method 1700 may be implementedby a UE 115 or its components as described herein. For example, theoperations of method 1700 may be performed by a communications manageras described with reference to FIGS. 7 through 10. In some examples, aUE may execute a set of instructions to control the functional elementsof the UE to perform the functions described below. Additionally oralternatively, a UE may perform aspects of the functions described belowusing special-purpose hardware.

At 1705, the UE may receive a system information including a bitmapindicating a subset of SSBs transmitted from a set of SSBs, the systeminformation signal further indicating a maximum number of SSBs availablefor use, where the maximum number of SSBs available for use is greaterthan a total number of SSBs in the set of SSBs. The operations of 1705may be performed according to the methods described herein. In someexamples, aspects of the operations of 1705 may be performed by a SSBparameter manager as described with reference to FIGS. 7 through 10.

At 1710, the UE may configure rate matching based on the subset of SSBsindicated by the bitmap and the indicated maximum number of SSBsavailable for use. The operations of 1710 may be performed according tothe methods described herein. In some examples, aspects of theoperations of 1710 may be performed by a rate matching manager asdescribed with reference to FIGS. 7 through 10.

At 1715, the UE may receive a physical downlink shared channeltransmission based on the rate matching. The operations of 1715 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1715 may be performed by a rate matchingmanager as described with reference to FIGS. 7 through 10.

FIG. 18 shows a flowchart illustrating a method 1800 that supportscontrol search space overlap indication in accordance with aspects ofthe present disclosure. The operations of method 1800 may be implementedby a base station 105 or its components as described herein. Forexample, the operations of method 1800 may be performed by acommunications manager as described with reference to FIGS. 11 through14. In some examples, a base station may execute a set of instructionsto control the functional elements of the base station to perform thefunctions described below. Additionally or alternatively, a base stationmay perform aspects of the functions described below usingspecial-purpose hardware.

At 1805, the base station may transmit a system information including abitmap indicating a subset of SSBs transmitted from a set of SSBs, thesystem information further indicating a maximum number of SSBs availablefor use, where the maximum number of SSBs available for use is greaterthan a total number of SSBs in the set of SSBs. The operations of 1805may be performed according to the methods described herein. In someexamples, aspects of the operations of 1805 may be performed by a SSBparameter manager as described with reference to FIGS. 11 through 14.

At 1810, the base station may configure rate matching based on thesubset of SSBs indicated by the bitmap and the indicated maximum numberof SSBs available for use. The operations of 1810 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1810 may be performed by a rate matching manager asdescribed with reference to FIGS. 11 through 14.

At 1815, the base station may perform a physical downlink shared channeltransmission based on the rate matching. The operations of 1815 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1815 may be performed by a rate matchingmanager as described with reference to FIGS. 11 through 14.

It should be noted that the methods described herein describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.A CDMA system may implement a radio technology such as CDMA2000,Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000,IS-95, and IS-856 standards. IS-2000 Releases may be commonly referredto as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) is commonly referred to asCDMA2000 1×EV-DO, High Rate Packet Data (HRPD), etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. A TDMA system mayimplement a radio technology such as Global System for MobileCommunications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are releasesof UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR,and GSM are described in documents from the organization named “3rdGeneration Partnership Project” (3GPP). CDMA2000 and UMB are describedin documents from an organization named “3rd Generation PartnershipProject 2” (3GPP2). The techniques described herein may be used for thesystems and radio technologies mentioned herein as well as other systemsand radio technologies. While aspects of an LTE, LTE-A, LTE-A Pro, or NRsystem may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in much of the description, thetechniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro,or NR applications.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEswith service subscriptions with the network provider. A small cell maybe associated with a lower-powered base station, as compared with amacro cell, and a small cell may operate in the same or different (e.g.,licensed, unlicensed, etc.) frequency bands as macro cells. Small cellsmay include pico cells, femto cells, and micro cells according tovarious examples. A pico cell, for example, may cover a small geographicarea and may allow unrestricted access by UEs with service subscriptionswith the network provider. A femto cell may also cover a smallgeographic area (e.g., a home) and may provide restricted access by UEshaving an association with the femto cell (e.g., UEs in a closedsubscriber group (CSG), UEs for users in the home, and the like). An eNBfor a macro cell may be referred to as a macro eNB. An eNB for a smallcell may be referred to as a small cell eNB, a pico eNB, a femto eNB, ora home eNB. An eNB may support one or multiple (e.g., two, three, four,and the like) cells, and may also support communications using one ormultiple component carriers.

The wireless communications systems described herein may supportsynchronous or asynchronous operation. For synchronous operation, thebase stations may have similar frame timing, and transmissions fromdifferent base stations may be approximately aligned in time. Forasynchronous operation, the base stations may have different frametiming, and transmissions from different base stations may not bealigned in time. The techniques described herein may be used for eithersynchronous or asynchronous operations.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the description may be represented byvoltages, currents, electromagnetic waves, magnetic fields or particles,optical fields or particles, or any combination thereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, an FPGA, or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described herein. A general-purpose processor may be amicroprocessor, but in the alternative, the processor may be anyconventional processor, controller, microcontroller, or state machine. Aprocessor may also be implemented as a combination of computing devices(e.g., a combination of a DSP and a microprocessor, multiplemicroprocessors, one or more microprocessors in conjunction with a DSPcore, or any other such configuration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described herein can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media mayinclude random-access memory (RAM), read-only memory (ROM), electricallyerasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROMor other optical disk storage, magnetic disk storage or other magneticstorage devices, or any other non-transitory medium that can be used tocarry or store desired program code means in the form of instructions ordata structures and that can be accessed by a general-purpose orspecial-purpose computer, or a general-purpose or special-purposeprocessor. Also, any connection is properly termed a computer-readablemedium. For example, if the software is transmitted from a website,server, or other remote source using a coaxial cable, fiber optic cable,twisted pair, digital subscriber line (DSL), or wireless technologiessuch as infrared, radio, and microwave, then the coaxial cable, fiberoptic cable, twisted pair, DSL, or wireless technologies such asinfrared, radio, and microwave are included in the definition of medium.Disk and disc, as used herein, include CD, laser disc, optical disc,digital versatile disc (DVD), floppy disk and Blu-ray disc where disksusually reproduce data magnetically, while discs reproduce dataoptically with lasers. Combinations of the above are also includedwithin the scope of computer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an exemplary step that is described as “based on conditionA” may be based on both a condition A and a condition B withoutdeparting from the scope of the present disclosure. In other words, asused herein, the phrase “based on” shall be construed in the same manneras the phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

1. A method for wireless communication at a user equipment (UE), comprising: receiving, from a base station, a synchronization signal block of a set of quasi-collocated synchronization signal blocks, the synchronization signal block comprising an indication of a parameter indicating information associated with a plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; determining, based at least in part on the parameter, the plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; receiving a downlink grant for a system information based at least in part on monitoring one or more downlink control channel locations of the plurality of downlink control channel locations; receiving the system information based at least in part on the downlink grant; and establishing a connection with the base station based at least in part on the synchronization signal block and the received system information.
 2. The method of claim 1, wherein the parameter comprises an indication of offset between successive synchronization signal blocks within the set of quasi-collocated synchronization signal blocks.
 3. The method of claim 1, wherein receiving the synchronization signal block comprises: receiving a physical broadcast channel portion of the synchronization signal block, the physical broadcast channel portion of the synchronization signal block comprising the indication of the parameter.
 4. The method of claim 3, wherein receiving the physical broadcast channel portion of the synchronization block comprises: performing soft combining across a plurality of synchronization signal blocks.
 5. The method of claim 4, wherein the indication of the parameter is common across each synchronization signal block of the plurality of synchronization signal blocks.
 6. The method of claim 5, wherein the plurality of synchronization signal blocks comprise at least one of the set of quasi-collocated synchronization signal blocks, a plurality of different sets of quasi-collocated synchronization signal blocks, each synchronization signal block associated with the base station, or a combination thereof.
 6. (canceled)
 7. The method of claim 1, wherein: determining the plurality of downlink control channel locations is based at least in part on a frame in which the synchronization signal block is received and the parameter indicated in the synchronization signal block.
 8. The method of claim 1, wherein receiving the downlink grant comprises: monitoring each downlink control channel location of the plurality of downlink control channel locations.
 9. The method of claim 1, wherein receiving the downlink grant comprises: determining that no downlink control information was detected during a first instance of the plurality of downlink control channel locations; and monitoring, based at least in part on the parameter, a second instance of the plurality of downlink control channel locations to detect the downlink grant.
 10. The method of claim 1, wherein the downlink control channel locations of the plurality of downlink control channel locations comprise type 0 physical downlink control channel common search spaces.
 11. A method for wireless communication at a base station, comprising: transmitting a plurality of synchronization signal blocks, the plurality of synchronization signal blocks comprising a set of quasi-collocated synchronization signal blocks, wherein each synchronization signal block of the plurality of synchronization signal blocks comprises an indication of a parameter indicating information associated with a plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; transmitting, based at least in part on the parameter, a downlink grant for a system information over the plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; transmitting the system information according to the grant; and establishing a connection with a user equipment based at least in part on the synchronization signal block and the system information.
 12. The method of claim 11, wherein the parameter comprises an indication of an offset between successive synchronization signal blocks within the set of quasi-collocated synchronization signal blocks.
 13. The method of claim 11, wherein transmitting the plurality of synchronization signal blocks comprises: transmitting a physical broadcast channel portion of the synchronization signal block, the physical broadcast portion of the synchronization signal block comprising the indication of the parameter.
 14. The method of claim 13, wherein the indication of the parameter is common across each synchronization signal block of the plurality of synchronization signal blocks.
 15. A method for wireless communication at a user equipment (UE), comprising: receiving a system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information signal further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks; configuring rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and receiving a physical downlink shared channel transmission based at least in part on the rate matching.
 16. The method of claim 15, wherein configuring rate matching comprises: repeating a pattern in the bitmap for the subset of synchronization signal blocks within the set of synchronization signal blocks and for synchronization signal blocks occurring after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.
 17. The method of claim 15, wherein receiving the system information comprises: receiving a previous physical downlink shared channel transmission comprising the system information; and decoding the system information to identify the bitmap, wherein rate matching is not performed on the previous physical downlink shared channel.
 18. The method of claim 15, wherein the physical downlink shared channel transmission is received during a same discovery period in which the maximum number of synchronization signal blocks available for use may be transmitted.
 19. A method for wireless communication at a base station, comprising: transmitting a system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks; configuring rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and performing a physical downlink shared channel transmission based at least in part on the rate matching.
 20. The method of claim 19, further comprising: repeating a pattern in the bitmap for transmitting the subset of synchronization signal blocks within the set of synchronization signal blocks and for a plurality of additional synchronization signal blocks transmitted after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.
 21. The method of claim 19, wherein transmitting the system information comprises: performing a previous physical downlink shared channel transmission comprising the system information.
 22. An apparatus for wireless communication at a user equipment (UE), comprising: a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive, from a base station, a synchronization signal block of a set of quasi-collocated synchronization signal blocks, the synchronization signal block comprising an indication of a parameter indicating information associated with a plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; determine, based at least in part on the parameter, the plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; receive a downlink grant for a system information based at least in part on monitoring one or more downlink control channel locations of the plurality of downlink control channel locations; receive the system information based at least in part on the downlink grant; and establish a connection with the base station based at least in part on the synchronization signal block and the received system information.
 23. The apparatus of claim 22, wherein the parameter comprises an indication of offset between successive synchronization signal blocks within the set of quasi-collocated synchronization signal blocks.
 24. The apparatus of claim 22, wherein the instructions to receive the synchronization signal block are executable by the processor to cause the apparatus to: receive a physical broadcast channel portion of the synchronization signal block, the physical broadcast channel portion of the synchronization signal block comprising the indication of the parameter.
 25. The apparatus of claim 24, wherein the instructions to receive the physical broadcast channel portion of the synchronization block are executable by the processor to cause the apparatus to: perform soft combining across a plurality of synchronization signal blocks.
 26. The apparatus of claim 25, wherein the indication of the parameter is common across each synchronization signal block of the plurality of synchronization signal blocks.
 27. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to: determine indices of each synchronization signal block of the set of quasi-collocated synchronization signal blocks, wherein determining the plurality of downlink control channel locations is based at least in part on the determined index of each synchronization signal block of the set of quasi-collocated synchronization signal blocks.
 28. The apparatus of claim 22, wherein determining the plurality of downlink control channel locations is based at least in part on a frame in which the synchronization signal block is received and the parameter indicated in the synchronization signal block.
 29. The apparatus of claim 22, wherein the instructions to receive the downlink grant are executable by the processor to cause the apparatus to: monitor each downlink control channel location of the plurality of downlink control channel locations.
 30. The apparatus of claim 22, wherein the instructions to receive the downlink grant are executable by the processor to cause the apparatus to: determine that no downlink control information was detected during a first instance of the plurality of downlink control channel locations; and monitor, based at least in part on the parameter, a second instance of the plurality of downlink control channel locations to detect the downlink grant.
 31. The apparatus of claim 22, wherein the downlink control channel locations of the plurality of downlink control channel locations comprise type 0 physical downlink control channel common search spaces.
 32. An apparatus for wireless communication at a base station, comprising: a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit a plurality of synchronization signal blocks, the plurality of synchronization signal blocks comprising a set of quasi-collocated synchronization signal blocks, wherein each synchronization signal block of the plurality of synchronization signal blocks comprises an indication of a parameter indicating information associated with a plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; transmit, based at least in part on the parameter, a downlink grant for a system information over the plurality of downlink control channel locations corresponding to the set of quasi-collocated synchronization signal blocks; transmit the system information according to the grant; and establish a connection with a user equipment based at least in part on the synchronization signal block and the system information.
 33. The apparatus of claim 32, wherein the parameter comprises an indication of an offset between successive synchronization signal blocks within the set of quasi-collocated synchronization signal blocks.
 34. The apparatus of claim 32, wherein the instructions to transmit the plurality of synchronization signal blocks are executable by the processor to cause the apparatus to: transmit a physical broadcast channel portion of the synchronization signal block, the physical broadcast portion of the synchronization signal block comprising the indication of the parameter.
 35. The apparatus of claim 34, wherein the indication of the parameter is common across each synchronization signal block of the plurality of synchronization signal blocks.
 36. An apparatus for wireless communication at a user equipment (UE), comprising: a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive a system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information signal further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks; configure rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and receive a physical downlink shared channel transmission based at least in part on the rate matching.
 37. The apparatus of claim 36, wherein the instructions to configure rate matching are executable by the processor to cause the apparatus to: repeat a pattern in the bitmap for the subset of synchronization signal blocks within the set of synchronization signal blocks and for synchronization signal blocks occurring after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.
 38. The apparatus of claim 36, wherein the instructions to receive the system information are executable by the processor to cause the apparatus to: receive a previous physical downlink shared channel transmission comprising the system information; and decode the system information to identify the bitmap, wherein rate matching is not performed on the previous physical downlink shared channel.
 39. The apparatus of claim 36, wherein the physical downlink shared channel transmission is received during a same discovery period in which the maximum number of synchronization signal blocks available for use may be transmitted.
 40. An apparatus for wireless communication at a base station, comprising: a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit a system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks; configure rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and perform a physical downlink shared channel transmission based at least in part on the rate matching.
 41. The apparatus of claim 40, wherein the instructions are further executable by the processor to cause the apparatus to: repeat a pattern in the bitmap for transmitting the subset of synchronization signal blocks within the set of synchronization signal blocks and for a plurality of additional synchronization signal blocks transmitted after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.
 42. The apparatus of claim 40, wherein the instructions to transmit the system information are executable by the processor to cause the apparatus to: perform a previous physical downlink shared channel transmission comprising the system information.
 43. The method of claim 1, further comprising: determining indices of each synchronization signal block of the set of quasi-collocated synchronization signal blocks, wherein determining the plurality of downlink control channel locations is based at least in part on the determined index of each synchronization signal block of the set of quasi-collocated synchronization signal blocks. 